A cadet branch consists of the male-line descendants of a monarch's or patriarch's younger sons (cadets). In the ruling dynasties and noble families of much of Europe and Asia, the family's major assets (realm, titles, fiefs, property and income) have historically been passed from a father to his firstborn son in what is known as primogeniture; younger sons, the cadets, inherited less wealth and authority (such as a small appenage) to pass on to future generations of descendants.
In families and cultures in which that was not the custom or law, such as the feudal Holy Roman Empire, the equal distribution of the family's holdings among male members was eventually apt to so fragment the inheritance as to render it too small to sustain the descendants at the socio-economic level of their forefather. Moreover, brothers and their descendants sometimes quarreled over their allocations, or even became estranged. While agnatic primogeniture became a common way of keeping the family's wealth intact and reducing familial disputes, it did so at the expense of younger sons and their descendants. Both before and after a state legal default of inheritance by primogeniture, younger brothers sometimes vied with older brothers to be chosen as their father's heir or, after the choice was made, sought to usurp the elder's birthright.
In such cases, primary responsibility for promoting the family's prestige, aggrandizement, and fortune fell upon the senior branch for future generations. A cadet, having less means, was not expected to produce a family. If a cadet chose to raise a family, its members were expected to maintain the family's social status by avoiding derogation, but could pursue endeavors too demeaning or too risky for the senior branch, such as emigration to another sovereign's realm, engagement in commerce, or a profession such as law, religion, academia, military service or government office.
Some cadet branches came to inherit the crown of the senior line, e.g. the Bourbon Counts of Vendôme mounted the throne of France (after civil war) in 1593; the House of Savoy-Carignan succeeded to the kingdoms of Sardinia (1831) and Italy (1861); the Counts Palatine of Zweibrücken obtained the Palatine Electorate of the Rhine (1799) and the Kingdom of Bavaria (1806); and a deposed Duke of Nassau was restored to sovereignty in the Grand Duchy of Luxembourg (1890).
In other cases, a junior branch came to eclipse more senior lines in rank and power, e.g. the Electors and Kings of Saxony who were a younger branch of the House of Wettin than the Grand Dukes of Saxe-Weimar.
A still more junior branch of the Wettins, headed by the rulers of the small Duchy of Saxe-Coburg and Gotha, would, through diplomacy or marriage in the 19th and 20th centuries, obtain or consort and sire the royal crowns of, successively, Belgium, Portugal, Bulgaria and the Commonwealth realms. Also, marriage to cadet males of the Houses of Oldenburg (Holstein-Gottorp), Polignac, and Bourbon-Parma brought those dynasties patrilineally to the thrones of Russia, Monaco, and Luxembourg, respectively. The Dutch royal house has, at different times, been a cadet branch of Mecklenburg and Lippe(-Biesterfeld). In the Commonwealth realms, the male-line descendants of Prince Philip, Duke of Edinburgh are cadet members of the House of Glücksburg.
It was a risk that cadet branches maintaining legal heirs could sink in status because shrunken wealth that was too meagre to survive the shifting political upheavals (legal mechanisms in factionalism or revolution of attainder, capital offences and show trials) as much as unpopularity or distance from the reigning line.
The House of Bourbon is a dynasty that originated in the Kingdom of France as a branch of the Capetian dynasty, the royal House of France. Bourbon kings first ruled France and Navarre in the 16th century. A branch descended from the French Bourbons came to rule Spain in the 18th century and is the current Spanish royal family. Further branches, descended from the Spanish Bourbons, held thrones in Naples, Sicily, and Parma. Today, Spain and Luxembourg have monarchs of the House of Bourbon. The royal Bourbons originated in 1272, when Robert, the youngest son of King Louis IX of France, married the heiress of the lordship of Bourbon. The house continued for three centuries as a cadet branch, serving as nobles under the direct Capetian and Valois kings.
Morganatic marriage, sometimes called a left-handed marriage, is a marriage between people of unequal social rank, which in the context of royalty or other inherited title prevents the principal's position or privileges being passed to the spouse, or any children born of the marriage. The concept is most prevalent in German-speaking territories and countries most influenced by the customs of the German-speaking realms.
A prince is a male ruler or a male member of a monarch's or former monarch's family. Prince is also a title of nobility, often hereditary, in some European states. The female equivalent is a princess. The English word derives, via the French word prince, from the Latin noun prīnceps, from primus (first) and caput (head), meaning "the first, foremost, the chief, most distinguished, noble ruler, prince".
The Capetian House of Valois was a cadet branch of the Capetian dynasty. They succeeded the House of Capet to the French throne, and were the royal house of France from 1328 to 1589. Junior members of the family founded cadet branches in Orléans, Anjou, Burgundy, and Alençon.
The Most Serene House of Bourbon-Condé, named after Condé-en-Brie, was a French princely house and a cadet branch of the House of Bourbon. The name of the house was derived from the title of Prince of Condé that was originally assumed around 1557 by the French Protestant leader Louis de Bourbon (1530–1569), uncle of King Henry IV of France, and borne by his male-line descendants.
An appanage, or apanage, is the grant of an estate, title, office or other thing of value to a younger child of a monarch, who would otherwise have no inheritance under the system of primogeniture. It was common in much of Europe.
The Legitimists are royalists who adhere to the rights of dynastic succession to the French crown of the descendants of the eldest branch of the Bourbon dynasty, which was overthrown in the 1830 July Revolution. They reject the claim of the July Monarchy of 1830–1848 which placed Louis Philippe, Duke of Orléans, head of the Orléans cadet branch of the Bourbon dynasty, on the throne until he too was dethroned and driven with his family into exile.
Holstein-Gottorp is the historiographical name, as well as contemporary shorthand name, for the parts of the duchies of Schleswig and Holstein, also known as Ducal Holstein, that were ruled by the dukes of Schleswig-Holstein-Gottorp, a side branch of the elder Danish line of the German House of Oldenburg. Other parts of the duchies were ruled by the kings of Denmark.
A pretender is someone who claims to be the rightful ruler of a country although not recognized as such by the current government. The term may often be used to either refer to a descendant of a deposed monarchy or a claim that is not legitimate.
Duke of Bourbon is a title in the peerage of France. It was created in the first half of the 14th century for the eldest son of Robert of France, Count of Clermont, and Beatrice of Burgundy, heiress of the lordship of Bourbon. In 1416, with the death of John of Valois, the Dukes of Bourbon were simultaneously Dukes of Auvergne.
The 4th House of Orléans, sometimes called the House of Bourbon-Orléans to distinguish it, is the fourth holder of a surname previously used by several branches of the Royal House of France, all descended in the legitimate male line from the dynasty's founder, Hugh Capet. The house was founded by Philippe I, Duke of Orléans, younger son of Louis XIII and younger brother of Louis XIV, the "Sun King".
Agnatic seniority is a patrilineal principle of inheritance where the order of succession to the throne prefers the monarch's younger brother over the monarch's own sons. A monarch's children succeed only after the males of the elder generation have all been exhausted. Agnatic seniority excludes females of the dynasty and their descendants from the succession. Contrast agnatic primogeniture, where the king's sons stand higher in succession than his brothers.
The House of Saxe-Coburg and Gotha is a European royal house. It takes its name from its oldest domain, the Ernestine duchy of Saxe-Coburg and Gotha, and its members later sat on the thrones of Belgium, Bulgaria, Portugal, and the United Kingdom and its dominions.
The House of Courtenay is a medieval noble house, with branches in France, England and the Holy Land. One branch of the Courtenays became a royal house of the Capetian dynasty, cousins of the Bourbons and the Valois, and achieved the title of Latin Emperor of Constantinople.
The Bourbon-Busset family is a cadet branch of the House of Bourbon, being thus agnatic descendants of the Capetian dynasty. Historically, they have been regarded as non-dynastic since decisions rendered by Louis XI of France.
The Orléanist claimant to the throne of France is Jean, Count of Paris. He is the uncontested heir to the Orléanist position of "King of the French" held by Louis-Philippe, and is also considered the Legitimist heir as "King of France" by those who view the 1713 Treaty of Utrecht as valid. According to the Family Compact of 1909, only the descendants of Henri, Count of Paris are considered to be French dynasts. The founders of the cadet branches of Orleans-Braganza and Orléans-Galliera, by becoming foreigners, are considered under house law to have lost their rights to the throne.
The House of Bourbon-Two Sicilies is a cadet branch of the House of Bourbon that ruled Southern Italy and Sicily for more than a century in the 18th and 19th centuries. It descends from the Capetian dynasty in legitimate male line through Philip, Duke of Anjou, a younger grandson of Louis XIV of France (1638–1715) who established the Bourbon dynasty in Spain in 1700 as Philip V (1683–1746). In 1759, King Philip's younger grandson was appanaged with the kingdoms of Naples and Sicily, becoming Ferdinand IV and III (1751–1825), respectively, of those realms. His descendants occupied the joint throne, merged as the "Kingdom of the Two Sicilies" in 1816, until 1861, claimed it thereafter from exile, and constitute the extant Bourbon-Two Sicilies family.
Bourbon-Vendôme refers to two branches of the House of Bourbon, the first of which became the senior legitimate line of the House of Bourbon in 1527, and succeeded to the throne of France in 1589 with Henry IV. He created the second house by granting the dukedom of Vendôme to one his legitimized sons.
A prince du sang or prince of the blood is a person legitimately descended in male line from a sovereign. The female equivalent is princess of the blood, being applied to the daughter of a prince of the blood. The most prominent examples include members of the French royal line, but the term prince of the blood has been used in other families more generally, for example among the British royal family and when referring to the Shinnōke in Japan.