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 Gregory VIII, born Alberto di Morra, was head of the Catholic Church and ruler of the Papal States for two months in 1187. Becoming Pope after a long diplomatic career as Apostolic Chancellor, he was notable in his brief reign for reconciling the Papacy with the estranged Holy Roman Empire and for initiating the Third Crusade.
Pope Innocent III, born Lotario dei Conti di Segni, was the head of the Catholic Church and ruler of the Papal States from 8 January 1198 until his death on 16 July 1216.
Frederick Barbarossa, also known as Frederick I, was the Holy Roman Emperor from 1155 until his death in 1190. He was elected King of Germany in Frankfurt on 4 March 1152 and crowned in Aachen on 9 March 1152. He was crowned King of Italy on 24 April 1155 in Pavia and emperor by Pope Adrian IV on 18 June 1155 in Rome. Two years later, the term sacrum ("holy") first appeared in a document in connection with his empire. He was later formally crowned King of Burgundy, at Arles on 30 June 1178. He was named Barbarossa by the northern Italian cities which he attempted to rule: Barbarossa means "red beard" in Italian; in German, he was known as Kaiser Rotbart, which in English means "Emperor Redbeard". The prevalence of the Italian nickname, even in later German usage, reflects the centrality of the Italian campaigns under his reign.
Pope Lucius III, born Ubaldo Allucingoli, reigned from 1 September 1181 to his death in 1185. Born of an aristocratic family of Lucca, prior to being elected pope, he had a long career as a papal diplomat. His papacy was marked by conflicts with Holy Roman Emperor Frederick I, his exile from Rome and the initial preparations for the Third Crusade.
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 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. During the 12th and 13th centuries, rivalry between these two parties dominated political life across medieval Italy. The struggle for power between the Papacy and the Holy Roman Empire arose with the Investiture Controversy, which began in 1075 and ended with the Concordat of Worms in 1122.
The history of Italy in the Middle Ages can be roughly defined as the time between the collapse of the Western Roman Empire and the Italian Renaissance. Late antiquity in Italy lingered on into the 7th century under the Ostrogothic Kingdom and the Byzantine Empire under the Justinian dynasty, the Byzantine Papacy until the mid 8th century. The "Middle Ages" proper begin as the Byzantine Empire was weakening under the pressure of the Muslim conquests, and most of the Exarchate of Ravenna finally fell under Lombard rule in 751. From this period, former states that were part of the Exarchate and were not conquered by the Lombard Kingdom, such as the Duchy of Naples, became de facto independent states, having less and less interference from the Eastern Roman Empire.
Victor IV was elected as a Ghibelline antipope in 1159, following the death of Pope Adrian IV and the election of Alexander III. His election was supported by Emperor Frederick Barbarossa. He took the name Victor IV, not acknowledging Antipope Victor IV of 1138, whose holding of the papal office was deemed illegitimate.
Antipope Paschal III was a 12th-century clergyman who, from 1164 to 1168, was the second antipope to challenge the reign of Pope Alexander III. He had previously served as Cardinal of St. Maria.
Rainald of Dassel was Archbishop of Cologne and Archchancellor of Italy from 1159 until his death. A close advisor to the Hohenstaufen emperor Frederick Barbarossa, he had an important influence on Imperial politics, mainly in the Italian conflict of Guelphs and Ghibellines.
Christian I (c. 1130 – 23 August 1183), sometimes Christian von Buch, was a German prelate and nobleman. He was Archbishop of Mainz and Archchancellor of Germany from 1165 until his death in 1183. He was originally elected archbishop in 1160 in a disputed election. He served the Emperor Frederick I as a diplomat in Italy on two occasions.
The Kingdom of Italy, also called Imperial Italy, was one of the constituent kingdoms of the Holy Roman Empire, along with the kingdoms of Germany, Bohemia, and Burgundy. It originally comprised large parts of northern and central Italy. Its original capital was Pavia until the 11th century.
In the Middle Ages, the term universal power referred to the Holy Roman Emperor and the Pope. Both were struggling for the so-called dominium mundi, or world dominion, in terms of political and spiritual supremacy.
The papal election held from 4 to 7 September 1159 following the death of Pope Adrian IV resulted in the election of two rival popes. A majority of the cardinals elected Cardinal Rolando of Siena as Pope Alexander III, but a minority refused to recognize him and elected their own candidate, Ottaviano de Monticelli, who took the name Victor IV, creating a schism that lasted until 1178.
The Byzantine Papacy was a period of Byzantine domination of the Roman Papacy from 537 to 752, when popes required the approval of the Byzantine Emperor for their episcopal consecration, and many popes were chosen from the apocrisiarii or the inhabitants of Byzantine-ruled Greece, Syria, or Sicily. Justinian I reconquered the Italian peninsula in the Gothic War (535–554) and appointed the next three popes, a practice that would be continued by his successors and later be delegated to the Exarchate of Ravenna.
With a long history as a vantage point for anti-popes forces threatening Rome, Viterbo became a papal city in 1243. During the later thirteenth century, the ancient Italian city of Viterbo was the site of five papal elections and the residence of seven popes and their Curias, and it remains the location of four papal tombs. These popes resided in the Palazzo dei Papi di Viterbo alongside the Viterbo Cathedral intermittently for two decades, from 1257 to 1281; as a result, the papal palace in Viterbo, with that in Orvieto, are the most extensive thirteenth-century papal palaces to have survived.
From the time of Constantine I's conversion to Christianity in the 4th century, the question of the relationship between temporal and spiritual power was constant, causing a clash between the Church and the Empire. The decline of imperial power initially allowed the pope to assert greater independence. However, beginning in 962, the Holy Roman Emperor assumed control over papal elections and the appointment of bishops, reinforcing imperial authority over the Church.
The Council of Tours was convened by Pope Alexander III in 1163. It opened on 19 May with a speech by Bishop Arnulf of Lisieux concerning the unity of the church. With well over 500 attendants, the council reaffirmed the excommunication of Antipope Victor IV, declared the Cathars heretics, and condemned clerical usury. Canonizations were postponed with Anselm of Canterbury's status being remitted to a provincial council.
