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Petrus Crassus was a jurist of the eleventh century, teaching at Ravenna. He is known for his treatise The Defence of King Henry (Latin: Defensio Henrici IV) from 1084 supporting the Emperor Henry IV against Pope Gregory VII during the investiture contest. [1]
According to the Catholic Encyclopedia , [2] he was the only layman involved in the struggle, and supported the autonomy of the state. Walter Ullmann says that the Defensio is "the first book that employed Roman law in a professional manner and in the service of public government." [3] Joseph Canning writes [4]
Peter Crassus' text also formed part of the general theme of Romanism developed among Italian supporters of the Salian monarchy, as witnessed by Benzo of Alba's Liber ad Heinrichum IV. (c.1085), with its emphasis on the central role of the emperor as ruler of the world (with Rome its head), 'vicar of the Creator' (vicarius conditoris) and maker of popes.
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The Council of Trent, held between 1545 and 1563 in Trent, now in northern Italy, was the 19th ecumenical council of the Catholic Church. Prompted by the Protestant Reformation at the time, it has been described as the embodiment of the Counter-Reformation.
The First Council of the Lateran was the 9th ecumenical council recognized by the Catholic Church. It was convoked by Pope Callixtus II in December 1122, immediately after the Concordat of Worms. The council sought to bring an end to the practice of the conferring of ecclesiastical benefices by people who were laymen, free the election of bishops and abbots from secular influence, clarify the separation of spiritual and temporal affairs, re-establish the principle that spiritual authority resides solely in the Church and abolish the claim of the Holy Roman Emperor to influence papal elections.
Pope Alexander III, born Roland, was head of the Catholic Church and ruler of the Papal States from 7 September 1159 until his death in 1181.
Pope Callixtus II or Callistus II, born Guy of Burgundy, was head of the Catholic Church and ruler of the Papal States from 1 February 1119 to his death in 1124. His pontificate was shaped by the Investiture Controversy, which he was able to settle through the Concordat of Worms in 1122.
Pope Urban II, otherwise known as Odo of Châtillon or Otho de Lagery, was the head of the Catholic Church and ruler of the Papal States from 12 March 1088 to his death. He is best known for convening the Council of Clermont which ignited the series of Christian conquests known as the Crusades. When the First Crusade was launched, Pope Urban II was 60 years old. Pope Urban was a native of France, and was a descendant of a noble family from the French commune of Châtillon-sur-Marne. Reims was the nearby cathedral school where he began his studies in 1050.
Pope Gregory VII, born Hildebrand of Sovana, was head of the Catholic Church and ruler of the Papal States from 22 April 1073 to his death in 1085. He is venerated as a saint in the Catholic Church.
Pope Paschal II, born Ranierius, was head of the Catholic Church and ruler of the Papal States from 13 August 1099 to his death in 1118. A monk of the Abbey of Cluny, he was created the cardinal-priest of San Clemente by Pope Gregory VII (1073–85) in 1073. He was consecrated as pope in succession to Pope Urban II (1088–99) on 19 August 1099. His reign of almost twenty years was exceptionally long for a medieval pope.
Pope Gelasius II, born Giovanni Caetani or Giovanni da Gaeta, was head of the Catholic Church and ruler of the Papal States from 24 January 1118 to his death in 1119. A monk of Monte Cassino and chancellor of Pope Paschal II, Caetani was unanimously elected to succeed him. In doing so, he also inherited the conflict with Emperor Henry V over investiture. Gelasius spent a good part of his brief papacy in exile.
The Holy Roman Emperor, originally and officially the Emperor of the Romans during the Middle Ages, and also known as the Roman-German Emperor since the early modern period, was the ruler and head of state of the Holy Roman Empire. The title was held in conjunction with the title of king of Italy from the 8th to the 16th century, and, almost without interruption, with the title of king of Germany throughout the 12th to 18th centuries.
The Donation of Constantine is a forged Roman imperial decree by which the 4th-century emperor Constantine the Great supposedly transferred authority over Rome and the western part of the Roman Empire to the Pope. Composed probably in the 8th century, it was used, especially in the 13th century, in support of claims of political authority by the papacy. In many of the existing manuscripts, including the oldest one, the document bears the title Constitutum domini Constantini imperatoris. The Donation of Constantine was included in the 9th-century Pseudo-Isidorean decretals.
The Investiture Controversy or Investiture Contest was a conflict between the Church and the state in medieval Europe over the ability to choose and install bishops (investiture) and abbots of monasteries and the pope himself. A series of popes in the 11th and 12th centuries undercut the power of the Holy Roman Emperor and other European monarchies, and the controversy led to nearly 50 years of conflict.
The Guelphs and Ghibellines were factions supporting respectively the Pope and the Holy Roman Emperor in the Italian city-states of Central Italy and Northern Italy during the Middle Ages.
The Road to Canossa or Humiliation of Canossa, or, sometimes, the Walk to Canossa was the journeying to Canossa Castle in 1077 of the Holy Roman Emperor, Henry IV, and his subsequent ritual submission there to Pope Gregory VII. It took place during the Investiture controversy and involved the Emperor seeking absolution and the revocation of his excommunication by the Pope who had been staying at the castle as the guest of Margravine Matilda of Tuscany.
Guibert or Wibert of Ravenna was an Italian prelate, archbishop of Ravenna, who was elected pope in 1080 in opposition to Pope Gregory VII and took the name Clement III. Gregory was the leader of the movement in the church which opposed the traditional claim of European monarchs to control ecclesiastical appointments, and this was opposed by supporters of monarchical rights led by the Holy Roman Emperor. This led to the conflict known as the Investiture Controversy. Gregory was felt by many to have gone too far when he excommunicated the Holy Roman Emperor Henry IV and supported a rival claimant as emperor, and in 1080 the pro-imperial Synod of Brixen pronounced that Gregory was deposed and replaced as pope by Guibert.
Anselm of Lucca, born Anselm of Baggio, was a medieval bishop of Lucca in Italy and a prominent figure in the Investiture Controversy amid the fighting in central Italy between Matilda, countess of Tuscany, and Emperor Henry IV. His uncle Anselm preceded him as bishop of Lucca before being elected to the papacy as Pope Alexander II and so he is sometimes distinguished as Anselm the Younger or Anselm II.
Godfrey of Viterbo was a Roman Catholic chronicler, either Italian or German. From an early age he displayed great activity as one of the clergy at the court of Conrad III and later Frederick I, accompanying the latter on many of his campaigns, and frequently fulfilling diplomatic missions for him.
Herman(n) of Salm, also known as Herman(n) of Luxembourg, the progenitor of the House of Salm, was Count of Salm and elected German anti-king from 1081 until his death.
The Saxon revolt was a civil war fought between 1077 and 1088, early in the history of the Holy Roman Empire. The revolt was led by a group of opportunistic German princes who elected as their figurehead the duke of Swabia, Rudolf of Rheinfeld, who became the anti-king. Rudolf was a two-way brother-in-law of the young King Henry IV of Germany, who had been crowned at the age of six and had taken the reins of power at age sixteen. The Great Revolt followed the Saxon Rebellion of 1073–75.
Papal appointment was a medieval method of selecting a pope. Popes have always been selected by a council of Church fathers, however, Papal selection before 1059 was often characterized by confirmation or nomination by secular European rulers or by their predecessors. The later procedures of the papal conclave are in large part designed to constrain the interference of secular rulers which characterized the first millennium of the Roman Catholic Church, and persisted in practices such as the creation of crown-cardinals and the jus exclusivae. Appointment might have taken several forms, with a variety of roles for the laity and civic leaders, Byzantine and Germanic emperors, and noble Roman families. The role of the election vis-a-vis the general population and the clergy was prone to vary considerably, with a nomination carrying weight that ranged from near total to a mere suggestion or ratification of a prior election.