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The final session of the Lateran Council, convened to rectify abuses in the papal electoral process that had led to the elevation of the antipopes Constantine II and Philip, was held in Rome.

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Lateran Council (769)
Synod held in Rome
The Lateran Council of 769 was a synod held in the Basilica of St. John Lateran to rectify perceived abuses in the papal electoral process which had led to the elevation of the antipopes Constantine II and Philip. It also condemned the rulings of the Council of Hieria. It is…Source: Wikipedia (CC BY-SA)
Papal selection before 1059
Selection of popes before 1059
The selection of the pope, the bishop of Rome and supreme pontiff of the Catholic Church, prior to the promulgation of In nomine Domini in 1059 varied throughout history. Popes were often putatively appointed by their predecessors or by political rulers. While some kind of…Source: Wikipedia (CC BY-SA)
Antipope
Person who claims to be the legitimate pope
An antipope is a person who claims to be Bishop of Rome and leader of the Roman Catholic Church in opposition to the officially elected pope. Between the 3rd and mid-15th centuries, antipopes were supported by factions within the Church itself and secular rulers. While modern…Source: Wikipedia (CC BY-SA)
Antipope Constantine II
8th-century antipope
Antipope Constantine II was a Roman prelate who claimed the papacy from 28 June 767 to 6 August 768. He was overthrown through the intervention of the Lombards and tortured before he was condemned and expelled from the Church during the Lateran Council of 769.Source: Wikipedia (CC BY-SA)
Antipope Philip
8th-century antipope
Antipope Philip was an antipope who held office for just one day, on 31 July 768.Source: Wikipedia (CC BY-SA)