Ferdinand I, Holy Roman Emperor

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Ferdinand I
Hans Bocksberger der Aeltere 001.jpg
Holy Roman Emperor
Reign27 August 1556 – 25 July 1564
Proclamation14 March 1558, Frankfurt
Predecessor Charles V
Successor Maximilian II
King of the Romans
Reign5 January 1531 – 25 July 1564
PredecessorCharles V
SuccessorMaximilian II
King of Hungary, Croatia, and Bohemia [lower-alpha 1]
Reign1526 – 25 July 1564
Predecessor Louis II
SuccessorMaximilian II
Archduke of Austria [lower-alpha 2]
Reign1521 – 25 July 1564
PredecessorCharles I
SuccessorMaximilian II (Austria proper)
Charles II (Inner Austria)
Ferdinand II (Further Austria)
Born10 March 1503
Alcalá de Henares, Castile, Spain
Died25 July 1564(1564-07-25) (aged 61)
Vienna, Austria
(m. 1521)
see detail...
House Habsburg
Father Philip I of Castile
Mother Joanna of Castile
Religion Roman Catholicism
Signature Fernando I of Holy Roman Empire signature.svg

Ferdinand I (Spanish : Fernando I) (10 March 1503 – 25 July 1564) was Holy Roman Emperor from 1556, King of Bohemia, Hungary, and Croatia from 1526, and Archduke of Austria from 1521 until his death in 1564. [1] [2] Before his accession, he ruled the Austrian hereditary lands of the Habsburgs in the name of his elder brother, Charles V, Holy Roman Emperor. Also, he often served as Charles' representative in the Holy Roman Empire and developed encouraging relationships with German princes. In addition, Ferdinand also developed valuable relationships with the German banking house of Jacob Fugger and the Castilian bank, Banca Palenzuela Levi Kahana.


The key events during his reign were the conflict with the Ottoman Empire, which in the 1520s began a great advance into Central Europe, and the Protestant Reformation, which resulted in several wars of religion. Ferdinand was able to defend his realm and make it somewhat more cohesive, but he was unable to fully conquer Hungary. His flexible approach to Imperial problems, mainly religious, brought more results than the more confrontational attitude of his brother. [3] Ferdinand's motto was Fiat iustitia, et pereat mundus : "Let justice be done, though the world perish". [4]



Ferdinand was born in Alcalá de Henares, Spain, the second son of Queen Joanna I of Castile from the House of Trastámara (herself the daughter of the Catholic Monarchs Isabel I of Castile and Ferdinand of Aragon) and Habsburg Archduke Philip the Handsome, who was heir to Maximilian I, Holy Roman Emperor. Ferdinand shared his customs, culture, name, and even his birthday with his maternal grandfather Ferdinand II of Aragon. He was born, raised, and educated in Spain, and did not learn German when he was a young adult.

In the summer of 1518 Ferdinand was sent to Flanders following his brother Charles's arrival in Spain as newly appointed King Charles I the previous autumn. Ferdinand returned in command of his brother's fleet but en route was blown off-course and spent four days in Kinsale in Ireland before reaching his destination. With the death of his grandfather Maximilian I and the accession of his now 19-year-old brother, Charles V, to title of Holy Roman Emperor in 1519, Ferdinand was entrusted with the government of the Austrian hereditary lands, roughly modern-day Austria and Slovenia. He was Archduke of Austria from 1521 to 1564. Though he supported his brother, Ferdinand also managed to strengthen his own realm. By adopting the German language and culture later in his life, he also grew close to the German territorial princes.

After the death of his brother-in-law Louis II, Ferdinand ruled as King of Bohemia and Hungary (1526–1564). [1] [5] Ferdinand also served as his brother's deputy in the Holy Roman Empire during his brother's many absences, and in 1531 was elected King of the Romans, making him Charles's designated heir in the empire. Charles abdicated in 1556 and Ferdinand adopted the title "Emperor elect", with the ratification of the Imperial diet taking place in 1558, [1] [6] while Spain, the Spanish Empire, Naples, Sicily, Milan, the Netherlands, and Franche-Comté went to Philip, son of Charles.

Hungary and the Ottomans

Ferdinand as a young boy Anonym Kaiser Ferdinand I.jpg
Ferdinand as a young boy

According to the terms set at the First Congress of Vienna in 1515, Ferdinand married Anne Jagiellonica, daughter of King Vladislaus II of Bohemia and Hungary on 22 July 1515. [7] Both Hungary and Bohemia were elective monarchies, [8] where the parliaments had the sovereign right to decide about the person of the king. Therefore, after the death of his brother-in-law Louis II, King of Bohemia and of Hungary, at the battle of Mohács on 29 August 1526, Ferdinand immediately applied to the parliaments of Hungary and Bohemia to participate as a candidate in the king elections. On 24 October 1526 the Bohemian Diet, acting under the influence of chancellor Adam of Hradce, elected Ferdinand King of Bohemia under conditions of confirming traditional privileges of the estates and also moving the Habsburg court to Prague. The success was only partial, as the Diet refused to recognise Ferdinand as hereditary lord of the Kingdom.

The throne of Hungary became the subject of a dynastic dispute between Ferdinand and John Zápolya, Voivode of Transylvania. They were supported by different factions of the nobility in the Hungarian kingdom. Ferdinand also had the support of his brother, the Emperor Charles V.

On 10 November 1526, John Zápolya was proclaimed king by a Diet at Székesfehérvár, elected in the parliament by the untitled lesser nobility (gentry).

Nicolaus Olahus, secretary of Louis, attached himself to the party of Ferdinand but retained his position with his sister, Queen Dowager Mary. Ferdinand was also elected King of Hungary, Dalmatia, Croatia, Slavonia, etc. by the higher aristocracy (the magnates or barons) and the Hungarian Catholic clergy in a rump Diet in Pozsony (Bratislava in Slovak) on 17 December 1526. [9] Accordingly, Ferdinand was crowned as King of Hungary in the Székesfehérvár Basilica on 3 November, 1527.

The Croatian nobles unanimously accepted the Pozsony election of Ferdinand I, receiving him as their king in the 1527 election in Cetin, and confirming the succession to him and his heirs. [10] In return for the throne, Archduke Ferdinand promised to respect the historic rights, freedoms, laws and customs of the Croats when they united with the Hungarian kingdom and to defend Croatia from Ottoman invasion. [2]

The Austrian lands were in miserable economic and financial conditions, thus Ferdinand desperately introduced the so-called Turkish Tax (Türken Steuer). In spite of the huge Austrian sacrifices, he was not able to collect enough money to pay for the expenses of the defence costs of Austrian lands. His annual revenues only allowed him to hire 5,000 mercenaries for two months, thus Ferdinand asked for help from his brother, Emperor Charles V, and started to borrow money from rich bankers like the Fugger family. [11]

Ferdinand defeated Zápolya at the Battle of Tarcal in September 1527 and again in the Battle of Szina in March 1528. Zápolya fled the country and applied to Sultan Suleiman the Magnificent for support, making Hungary an Ottoman vassal state.

This led to the most dangerous moment of Ferdinand's career, in 1529, when Suleiman took advantage of this Hungarian support for a massive but ultimately unsuccessful assault on Ferdinand's capital: the Siege of Vienna, which sent Ferdinand to refuge in Bohemia. A further Ottoman invasion was repelled in 1532 (see Siege of Güns). In that year Ferdinand made peace with the Ottomans, splitting Hungary into a Habsburg sector in the west and John Zápolya's domain in the east, the latter effectively a vassal state of the Ottoman Empire.

Together with the formation of the Schmalkaldic League in 1531, this struggle with the Ottomans caused Ferdinand to grant the Nuremberg Religious Peace. As long as he hoped for a favorable response from his humiliating overtures to Suleiman, Ferdinand was not inclined to grant the peace which the Protestants demanded at the Diet of Regensburg which met in April 1532. But as the army of Suleiman drew nearer he yielded and on 23 July 1532 the peace was concluded at Nuremberg where the final deliberations took place. Those who had up to this time joined the Reformation obtained religious liberty until the meeting of a council and in a separate compact all proceedings in matters of religion pending before the imperial chamber court were temporarily paused. [12]

Arms of Ferdinand, Infante of Spain and Archduke of Austria, KG, at the time of his installation as a knight of the Most Noble Order of the Garter Coat of arms of Ferdinand, Infant of Spain, Archduke of Austria, KG.png
Arms of Ferdinand, Infante of Spain and Archduke of Austria, KG, at the time of his installation as a knight of the Most Noble Order of the Garter

In 1538, in the Treaty of Nagyvárad, Ferdinand induced the childless Zápolya to name him as his successor. But in 1540, just before his death, Zápolya had a son, John II Sigismund, who was promptly elected King by the Diet. Ferdinand invaded Hungary, but the regent, Frater George Martinuzzi, Bishop of Várad, called on the Ottomans for protection. Suleiman marched into Hungary (see Siege of Buda (1541)) and not only drove Ferdinand out of central Hungary, he forced Ferdinand to agree to pay tribute for his lands in western Hungary. [13]

John II Sigismund was also supported by King Sigismund I of Poland, his mother's father, but in 1543 Sigismund made a treaty with the Habsburgs and Poland became neutral. Prince Sigismund Augustus married Elisabeth of Austria, Ferdinand's daughter.

Suleiman had allocated Transylvania and eastern Royal Hungary to John II Sigismund, which became the "Eastern Hungarian Kingdom", reigned over by his mother, Isabella Jagiełło, with Martinuzzi as the real power. But Isabella's hostile intrigues and threats from the Ottomans led Martinuzzi to switch round. In 1549, he agreed to support Ferdinand's claim, and Imperial armies marched into Transylvania. In the Treaty of Weissenburg (1551), Isabella agreed on behalf of John II Sigismund to abdicate as King of Hungary and to hand over the royal crown and regalia. Thus Royal Hungary and Transylvania went to Ferdinand, who agreed to recognise John II Sigismund as vassal Prince of Transylvania and betrothed one of his daughters to him. Meanwhile, Martinuzzi attempted to keep the Ottomans happy even after they responded by sending troops. Ferdinand's general Castaldo suspected Martinuzzi of treason and with Ferdinand's approval had him killed.

Since Martinuzzi was by this time an archbishop and Cardinal, this was a shocking act, and Pope Julius III excommunicated Castaldo and Ferdinand. Ferdinand sent the Pope a long accusation of treason against Martinuzzi in 87 articles, supported by 116 witnesses. The Pope exonerated Ferdinand and lifted the excommunications in 1555. [14]

The war in Hungary continued. Ferdinand was unable to keep the Ottomans out of Hungary. In 1554, Ferdinand sent Ogier Ghiselin de Busbecq to Constantinople to discuss a border treaty with Suleiman, but he could achieve nothing. In 1556 the Diet returned John II Sigismund to the eastern Hungarian throne, where he remained until 1570. De Busbecq returned to Constantinople in 1556, and succeeded on his second try.

The Austrian branch of Habsburg monarchs needed the economic power of Hungary for the Ottoman wars. During the Ottoman wars the territory of the former Kingdom of Hungary shrunk by around 70%. Despite these enormous territorial and demographic losses, the smaller, heavily war-torn Royal Hungary had remained economically more important to the Habsburg rulers than Austria or Kingdom of Bohemia even at the end of the 16th century. [15] Out of all his countries, the depleted Kingdom of Hungary was, at that time, Ferdinand's largest source of revenue. [16]

Consolidation of power in Bohemia

Ferdinand in 1531, the year of his election as King of the Romans Bemberg Fondation Toulouse - Portrait paintings of Ferdinand I, Holy Roman Emperor by Jan Cornelisz Vermeyen Inv.1056.jpg
Ferdinand in 1531, the year of his election as King of the Romans

When he took control of the Bohemian lands in the 1520s, their religious situation was complex. Its German population was composed of Catholics and Lutherans. Some Czechs were receptive to Lutheranism, but most of them adhered to Utraquist Hussitism, while a minority of them adhered to Roman Catholicism. A significant number of Utraquists favoured an alliance with the Protestants. [17] At first, Ferdinand accepted this situation and he gave considerable freedom to the Bohemian estates. In the 1540s, the situation changed. In Germany, while most Protestant princes had hitherto favored negotiation with the Emperor and while many had supported him in his wars, they became increasingly confrontational during this decade. Some of them even went to war against the Empire, and many Bohemian (German or Czech) Protestants or Utraquists sympathized with them. [17]

Ferdinand and his son Maximilian participated in the victorious campaign of Charles V against the German Protestants in 1547. The same year, he also defeated a Protestant revolt in Bohemia, where the estates and a large part of the nobility had denied him support in the German campaign. This allowed him to increase his power in this realm. He centralized his administration, revoked many urban privileges and confiscated properties. [17] Ferdinand also sought to strengthen the position of the Catholic church in the Bohemian lands, and favoured the installation of the Jesuits there.

Ferdinand and the Augsburg Peace of 1555

In the 1550s, Ferdinand managed to win some key victories on the imperial scene. Unlike his brother, he opposed Albrecht of Brandenburg-Kulmbach and participated in his defeat. [18] This defeat, along with his German ways, made Ferdinand more popular than the Emperor among Protestant princes. This allowed him to play a critical role in the settlement of the religious issue in the Empire.

After decades of religious and political unrest in the German states, Charles V ordered a general Diet in Augsburg at which the various states would discuss the religious problem and its solution. Charles himself did not attend, and delegated authority to his brother, Ferdinand, to "act and settle" disputes of territory, religion and local power. [19] At the conference, which opened on 5 February, Ferdinand cajoled, persuaded and threatened the various representatives into agreement on three important principles promulgated on 25 September:

  1. The principle of cuius regio, eius religio ("Whose realm, his religion") provided for internal religious unity within a state: the religion of the prince became the religion of the state and all its inhabitants. Those inhabitants who could not conform to the prince's religion were allowed to leave, an innovative idea in the sixteenth century. This principle was discussed at length by the various delegates, who finally reached agreement on the specifics of its wording after examining the problem and the proposed solution from every possible angle.
  2. The second principle, called the reservatum ecclesiasticum (ecclesiastical reservation), covered the special status of the ecclesiastical state. If the prelate of an ecclesiastic state changed his religion, the men and women living in that state did not have to do so. Instead, the prelate was expected to resign from his post, although this was not spelled out in the agreement.
  3. The third principle, known as Declaratio Ferdinandei (Ferdinand's Declaration), exempted knights and some of the cities from the requirement of religious uniformity, if the reformed religion had been practised there since the mid-1520s, allowing for a few mixed cities and towns where Catholics and Lutherans had lived together. It also protected the authority of the princely families, the knights and some of the cities to determine what religious uniformity meant in their territories. Ferdinand inserted this at the last minute, on his own authority. [20]

Problems with the Augsburg settlement

Armor of Ferdinand I, Holy Roman Emperor, created when he was still King of the Romans in 1549. Armor of Emperor Ferdinand I (1503-1564) MET DT773.jpg
Armor of Ferdinand I, Holy Roman Emperor , created when he was still King of the Romans in 1549.

After 1555, the Peace of Augsburg became the legitimating legal document governing the co-existence of the Lutheran and Catholic faiths in the German lands of the Holy Roman Empire, and it served to ameliorate many of the tensions between followers of the "Old Faith" (Catholicism) and the followers of Luther, but it had two fundamental flaws. First, Ferdinand had rushed the article on reservatum ecclesiasticum through the debate; it had not undergone the scrutiny and discussion that attended the widespread acceptance and support of cuius regio, eius religio. Consequently, its wording did not cover all, or even most, potential legal scenarios. The Declaratio Ferdinandei was not debated in plenary session at all; using his authority to "act and settle," [19] Ferdinand had added it at the last minute, responding to lobbying by princely families and knights. [21]

While these specific failings came back to haunt the Empire in subsequent decades, perhaps the greatest weakness of the Peace of Augsburg was its failure to take into account the growing diversity of religious expression emerging in the so-called evangelical and reformed traditions. Other confessions had acquired popular, if not legal, legitimacy in the intervening decades and by 1555, the reforms proposed by Luther were no longer the only possibilities of religious expression: Anabaptists, such as the Frisian Menno Simons (1492–1559) and his followers; the followers of John Calvin, who were particularly strong in the southwest and the northwest; and the followers of Huldrych Zwingli were excluded from considerations and protections under the Peace of Augsburg. According to the Augsburg agreement, their religious beliefs remained heretical. [22]

Charles V's abdication

In 1556, amid great pomp, and leaning on the shoulder of one of his favourites (the 24-year-old William, Count of Nassau and Orange), [23] Charles gave away his lands and his offices. The Spanish empire, which included Spain, the Netherlands, Naples, Milan and Spain's possessions in the Americas, went to his son, Philip. Ferdinand became suo jure monarch in Austria and succeeded Charles as Holy Roman Emperor. [24] This course of events had been guaranteed already on 5 January 1531 when Ferdinand had been elected the King of the Romans and so the legitimate successor of the reigning Emperor.

Coat of arms of Ferdinand I as King of the Romans, 1536, Hofburg palace, Vienna CoA of later Ferdinand I Holy Roman Emperor as King of the Romans 1536 Hofburg Wien Austria.jpg
Coat of arms of Ferdinand I as King of the Romans, 1536, Hofburg palace, Vienna

Charles's choices were appropriate. Philip was culturally Spanish: he was born in Valladolid and raised in the Spanish court, his native tongue was Spanish, and he preferred to live in Spain. Ferdinand was familiar with, and to, the other princes of the Holy Roman Empire. Although he too had been born in Spain, he had administered his brother's affairs in the Empire since 1531. [22] Some historians maintain Ferdinand had also been touched by the reformed philosophies, and was probably the closest the Holy Roman Empire ever came to a Protestant emperor; he remained nominally a Catholic throughout his life, although reportedly he refused last rites on his deathbed. [25] Other historians maintain he was as Catholic as his brother, but tended to see religion as outside the political sphere. [26]

Charles' abdication had far-reaching consequences in imperial diplomatic relations with France and the Netherlands, particularly in his allotment of the Spanish kingdom to Philip. In France, the kings and their ministers grew increasingly uneasy about Habsburg encirclement and sought allies against Habsburg hegemony from among the border German territories, and even from some of the Protestant kings. In the Netherlands, Philip's ascension in Spain raised particular problems; for the sake of harmony, order, and prosperity Charles had not blocked the Reformation, and had tolerated a high level of local autonomy. An ardent Catholic and rigidly autocratic prince, Philip pursued an aggressive political, economic and religious policy toward the Dutch, resulting in a Dutch rebellion shortly after he became king. Philip's militant response meant the occupation of much of the upper provinces by troops of, or hired by, Habsburg Spain and the constant ebb and flow of Spanish men and provisions on the so-called Spanish road from northern Italy, through the Burgundian lands, to and from Flanders. [27]

Holy Roman Emperor (1556–1564)

Charles abdicated as Emperor in August 1556 in favor of his brother Ferdinand. Given the settlement of 1521 and the election of 1531, Ferdinand became Holy Roman Emperor and suo jure Archduke of Austria. Due to lengthy debate and bureaucratic procedure, the Imperial Diet did not accept the Imperial succession until 3 May 1558. The Pope refused to recognize Ferdinand as Emperor until 1559, when peace was reached between France and the Habsburgs. During his Emperorship, the Council of Trent came to an end. Ferdinand organized an Imperial election in 1562 in order to secure the succession of his son Maximilian II. Venetian ambassadors to Ferdinand recall in their Relazioni the Emperor's pragmatism and his ability to speak multiple languages. Several issues of the Council of Trent were solved after a compromise was personally reached between Emperor Ferdinand and Morone, the papal legate.


Posthumous engraving of Ferdinand by Martin Rota, 1575 Ferdinand I by Martin Rota.jpg
Posthumous engraving of Ferdinand by Martin Rota, 1575

The western rump of Hungary over which Ferdinand retained dominion became known as Royal Hungary. As the ruler of Austria, Bohemia and Royal Hungary, Ferdinand adopted a policy of centralisation and, in common with other monarchs of the time, the construction of an absolute monarchy. In 1527, soon after ascending the throne, he published a constitution for his hereditary domains (Hofstaatsordnung) and established Austrian-style institutions in Pressburg for Hungary, in Prague for Bohemia, and in Breslau for Silesia. Opposition from the nobles in those realms forced him to concede the independence of these institutions from supervision by the Austrian government in Vienna in 1559.

After the Ottoman invasion of Hungary the traditional Hungarian coronation city Székesfehérvár came under Turkish occupation. Thus, in 1536 the Hungarian Diet decided that a new place for coronation of the king as well as a meeting place for the Diet itself would be set in Pressburg. Ferdinand proposed that the Hungarian and Bohemian diets should convene and hold debates together with the Austrian estates, but all parties refused such an innovation.

In 1547 the Bohemian Estates rebelled against Ferdinand after he had ordered the Bohemian army to move against the German Protestants. After suppressing the revolt, he retaliated by limiting the privileges of Bohemian cities and inserting a new bureaucracy of royal officials to control urban authorities. Ferdinand was a supporter of the Counter-Reformation and helped lead the Catholic response against what he saw as the heretical tide of Protestantism. For example, in 1551 he invited the Jesuits to Vienna and in 1556 to Prague. Finally, in 1561 Ferdinand revived the Archdiocese of Prague, which had been previously liquidated due to the success of the Protestants.

Ferdinand died in Vienna in 1564 and is buried in St. Vitus Cathedral in Prague.


Ferdinand's legacy ultimately proved enduring. Though lacking resources, he managed to defend his land against the Ottomans with limited support from his brother, and even secured a part of Hungary that would later provide the basis for the conquest of the whole kingdom by the Habsburgs. In his own possessions, he built a tax system that, though imperfect, would continue to be used by his successors. [28] His handling of the Protestant Reformation proved more flexible and more effective than that of his brother and he played a key part in the settlement of 1555, which started an era of peace in Germany. His statesmanship, overall, was cautious and effective, well-suited to a medium-sized collection of territories facing dangerous threats. On the other hand, when he engaged in more audacious endeavours, like his offensives against Buda and Pest, it often ended in failure.

Ferdinand was also a patron of the arts. He embellished Vienna and Prague, and invited Italian architects to his realm. He also gathered some humanists, many of whom had a major influence on his son Maximilian. He was particularly fond of music and hunting. While not a supremely gifted commander, he was interested in military matters and participated in several campaigns during his reign.

Name in other languages

German, Czech, Slovenian, Slovak, Serbian, Croatian : Ferdinand I.; Hungarian : I. Ferdinánd; Spanish: Fernando I; Turkish : 1. Ferdinand; Polish : Ferdynand I.

Marriage and children

On 26 May 1521 in Linz, Austria, Ferdinand married Anna of Bohemia and Hungary (1503–1547), daughter of Vladislaus II of Bohemia and Hungary and his wife Anne de Foix. [7] They had fifteen children, all but two of whom reached adulthood:

Elizabeth 9 July 152615 June 1545Married to the future King Sigismund II Augustus of Poland.
Maximilian II, Holy Roman Emperor 31 July 152712 October 1576Married to his first cousin Maria of Spain and had issue. [29]
Anna 7 July 152816/17 October 1590Married to Albert V, Duke of Bavaria. [29]
Ferdinand II, Archduke of Austria [29] 14 June 152924 January 1595Married to Philippine Welser and then to his niece (daughter of Eleanor) Anne Juliana Gonzaga.
Maria 15 May 153111 December 1581Married to Wilhelm, Duke of Jülich-Cleves-Berg. [29]
Magdalena 14 August 153210 September 1590A nun.
Catherine 15 September 153328 February 1572Married to Duke Francesco III of Mantua [30] and then to King Sigismund II Augustus of Poland [31]
Eleanor 2 November 15345 August 1594Married to William I, Duke of Mantua.
Margaret 16 February 153612 March 1567A nun.
John10 April 153820 March 1539Died in childhood.
Barbara 30 April 153919 September 1572Married to Alfonso II, Duke of Ferrara and Modena.
Charles II, Archduke of Austria [29] 3 June 154010 July 1590Father of Ferdinand II, Holy Roman Emperor.
Ursula24 July 154130 April 1543Died in childhood
Helena 7 January 15435 March 1574A nun.
Joanna 24 January 154710 April 1578Married to Francesco I de' Medici, Grand Duke of Tuscany. [29]




The Renaissance coin 2002 Austria Renaissance Ferdinand I back.jpg
The Renaissance coin

Ferdinand I has been the main motif for many collector coins and medals. The most recent one is the Austrian silver 20-euro Renaissance coin issued on 12 June 2002. A portrait of Ferdinand I is shown on the reverse of the coin, while on the obverse a view of the Swiss Gate of the Hofburg Palace can be seen.

See also


  1. Hungary & Croatia contested by John I (1526–40) and John II Sigismund (1540–51, 1556–64)
  2. In the name of Emperor Charles V until 1556

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Isabella Jagiellon 16th-century Queen Consort of Hungary

Isabella Jagiellon was the oldest child of Polish King Sigismund I the Old, the Grand Duke of Lithuania and his Italian wife Bona Sforza. In 1539, she married John Zápolya, Voivode of Transylvania and King of Hungary, becoming Queen consort of Hungary. At the time Hungary was contested between Archduke Ferdinand of Austria who wanted to add it to the Habsburg domains, local nobles who wanted to keep Hungary independent, and Sultan Suleiman the Magnificent who saw it as a vassal state of the Ottoman Empire. While Isabella's marriage lasted only a year and a half, it did produce a male heir – John Sigismund Zápolya born just two weeks before his father's death in July 1540. She spent the rest of her life embroiled in succession disputes on behalf of her son. Her husband's death sparked renewed hostilities but Sultan Suleiman established her as a regent of the eastern regions of the medieval Kingdom of Hungary on behalf of her infant son. The region developed as a semi-independent buffer state noted for its freedom of religion. Ferdinand, however, never renounced his claims to reunite Hungary and conspired with Bishop George Martinuzzi who forced Isabella to abdicate in 1551. She returned to her native Poland to live with her family. Sultan Suleiman retaliated and threatened to invade Hungary in 1555–56 forcing nobles to invite Isabella back to Transylvania. She returned in October 1556 and ruled as her son's regent until her death in September 1559.

The Prince of Transylvania was the head of state of the Principality of Transylvania from the last decades of the 16th century until the middle of the 18th century. John Sigismund Zápolya was the first to adopt the title in 1570, but its use only became stable from 1576.

George Martinuzzi 16th-century Croatian Catholic nobleman, cardinal, and statesman

George Martinuzzi, O.S.P., was a Croatian nobleman, Pauline monk and Hungarian statesman who supported King John Zápolya and his son, King John Sigismund Zápolya. He was Bishop of Nagyvárad, Archbishop of Esztergom and a cardinal.

Anne of Bohemia and Hungary 16th century Queen of Germany

Anna of Bohemia and Hungary, sometimes known as Anna Jagellonica, was Queen of Germany, Bohemia, and Hungary and Archduchess of Austria as the wife of King Ferdinand I.

Elizabeth of Austria (1526–1545) Queen consort of Poland

Elizabeth of Austria was a Queen consort of Poland. She was the eldest of fifteen children of Ferdinand I, Holy Roman Emperor, and his wife Anne of Bohemia and Hungary. A member of the House of Habsburg, she was married off to Sigismund II Augustus, who was already crowned as King of Poland and Grand Duke of Lithuania even though both of his parents were still alive and well. The marriage was short and unhappy. Elizabeth was of frail health, suffering from epileptic seizures, and died at age 18.

Catherine of Austria, Queen of Poland Queen consort of Poland

Catherine of Austria was one of the fifteen children of Ferdinand I, Holy Roman Emperor and Anna of Bohemia and Hungary. In 1553, she married Polish King Sigismund II Augustus and became Queen consort of Poland and Grand Duchess consort of Lithuania. Their marriage was not happy and they had no children together. After a likely miscarriage in 1554 and a bout of illness in 1558, Sigismund became increasingly distant. He tried but failed to obtain a divorce from the pope. In 1565, Catherine returned to Austria and lived in Linz until her death. Sigismund died just a few months after her bringing the Jagiellon dynasty to its end.

Archduchy of Austria Fief of the Holy Roman Empire

The Archduchy of Austria was a major principality of the Holy Roman Empire and the nucleus of the Habsburg Monarchy. With its capital at Vienna, the archduchy was centered at the Empire's southeastern periphery.

Eastern Hungarian Kingdom

The Eastern Hungarian Kingdom is a modern term coined by historians to designate the realm of John Zápolya and his son John Sigismund Zápolya, who contested the claims of the House of Habsburg to rule the Kingdom of Hungary from 1526 to 1570. The Zápolyas ruled over an eastern part of Hungary, and the Habsburg kings ruled the west. The Habsburgs tried several times to unite all Hungary under their rule, but the Ottoman Empire prevented that by supporting the Eastern Hungarian Kingdom.

Siege of Buda (1541) Siege during Little War in Hungary

The siege of Buda ended with the capture of the city of Buda, Hungary by the Ottoman Empire, leading to 150 years of Ottoman control of Hungary. The siege, part of the Little War in Hungary, was one of the most important Ottoman victories over the Habsburg Monarchy during Ottoman–Habsburg wars in Hungary and the Balkans.

During the siege of Naģykanizsa in 1601, a small Ottoman force held the fortress of Naģykanizsa in western Hungary against a much larger coalition army of the Habsburg Monarchy, while inflicting heavy losses on its besiegers.


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Further reading

Ferdinand I, Holy Roman Emperor
Born: 10 March 1503 Died: 25 July 1564
Regnal titles
Preceded by
Emperor Charles V
Archduke of Austria
Succeeded by
Maximilian II
as Archduke of Austria proper
Succeeded by
Charles II
as Archduke of Inner Austria
Succeeded by
Ferdinand II
as Archduke of Further Austria
King of the Romans
King in Germany

Succeeded by
Emperor Maximilian II
Holy Roman Emperor
Preceded by
Louis II
King of Hungary and Croatia
With: John I and John II Sigismund as contenders
King of Bohemia