Pope Sylvester I was the bishop of Rome from 31 January 314 until his death on 31 December 335. He filled the See of Rome at an important era in the history of the Western Church, though very little is known of his life.
Pope Stephen IV was the bishop of Rome and ruler of the Papal States from June 816 to his death. Stephen belonged to a noble Roman family. In October 816, he crowned Louis the Pious as emperor at Reims, and persuaded him to release some Roman political prisoners he held in custody. He returned to Rome, by way of Ravenna, sometime in November and died the following January.
Pope Sergius II was the bishop of Rome and ruler of the Papal States from January 844 to his death in 847. Sergius II's pontificate saw the Arab raid against Rome as well as the city's redevelopment.
Pope Sergius IV was the bishop of Rome and nominal ruler of the Papal States from 31 July 1009 to his death. His temporal power was eclipsed by the patrician John Crescentius. Sergius IV may have called for the expulsion of Muslims from the Holy Land, but this is disputed. Since his time, the practice that the person who has been elected to the office of pope takes on a new name became a tradition.
Pope Leo V was the bishop of Rome and nominal ruler of the Papal States from July 903 to his death in February 904. He was pope immediately before the period known as the Saeculum obscurum, when popes wielded little temporal authority.
Otto III was the Holy Roman Emperor from 996 until his death in 1002. A member of the Ottonian dynasty, Otto III was the only son of the Emperor Otto II and his wife Theophanu.
Pope John XV was the bishop of Rome and ruler of the Papal States from August 985 until his death. A Roman by birth, he was the first pope who canonized a saint. The origins of the investiture controversy stem from John XV's pontificate, when the dispute about the deposition of Archbishop Arnulf of Reims soured the relationship between the Capetian kings of France and the Holy See.
Pope John XI was the bishop of Rome and nominal ruler of the Papal States from March 931 to his death. The true ruler of Rome at the time was his mother, Marozia, followed by his brother Alberic II. His pontificate occurred during the period known as Saeculum obscurum.
Pope John VI was the bishop of Rome from 30 October 701 to his death. John VI was a Greek from Ephesus who reigned during the Byzantine Papacy. His papacy was noted for military and political breakthroughs on the Italian Peninsula. He was succeeded by Pope John VII after a vacancy of less than two months. The body of the pope was buried in Old St. Peter's Basilica.
Pope John XVII, born John Sicco, was the bishop of Rome and nominal ruler of the Papal States for about seven months in 1003. He was one of the popes chosen and eclipsed by the patrician John Crescentius.
Pope John XVIII was the bishop of Rome and nominal ruler of the Papal States from January 1004 to his abdication in July 1009. He wielded little temporal power, ruling during the struggle between John Crescentius and Emperor Henry II for the control of Rome.
John XVI was an antipope from 997 to 998.
The Crescentii were a baronial family, attested in Rome from the beginning of the 10th century and which in fact ruled the city and the election of the popes until the beginning of the 11th century.
On the death of Pope Sergius IV in June 1012, "a certain Gregory" opposed the party of the Theophylae, and had himself made pope, seemingly by a small faction. Gregory VI was the first to claim to be pope as successor to Sergius IV, and that Benedict VIII's claim was subsequent.
Heribert of Cologne, also known as Saint Heribert, was a German Roman Catholic prelate who served as the Archbishop of Cologne from 999 until his death. He also served as the Chancellor for the Emperor Otto III since 994. He also collaborated with Henry II, Holy Roman Emperor with whom relations were strained though were strengthened over time.
Crescentius the Elder, also known as Crescenzio de Theodora, was a politician and aristocrat in Rome who played a part in the papal appointment.
Crescentius the Younger, son of Crescentius the Elder, was a leader of the aristocracy of medieval Rome. During the minority of Holy Roman Emperor Otto III, he declared himself Consul of Rome and made himself de facto ruler of Rome. After being deposed, he led a rebellion, seized control of Rome, and appointed an antipope, but the rebellion failed and Crescentius was eventually executed.
Papal appointment was a medieval method of selecting the 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 the preceding pope. The later procedures of the Papal conclave are in large part designed to prohibit interference of secular rulers, which to some extent characterized the first millennium of the Roman Catholic Church, e. g. in practices such as the creation of crown-cardinals and the claimed but invalid jus exclusivae. Appointment may 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 nearly determinative to merely suggestive, or as ratification of a concluded election.
From 756 to 857, the papacy shifted from the influence of the Byzantine Empire to that of the kings of the Franks. Pepin the Short, Charlemagne, and Louis the Pious had considerable influence in the selection and administration of popes. The "Donation of Pepin" (756) ratified a new period of papal rule in central Italy, which became known as the Papal States.
