Lateran Council, First

Lateran Council, First,

1123, 9th ecumenical council of the Roman Catholic Church, summoned by Pope Calixtus IICalixtus II,
 Callixtus II,
or Callistus II,
d. 1124, pope (1119–24), named Guy of Burgundy, successor of Gelasius II. The son of count William I of Burgundy, he was archbishop of Vienne during the investiture controversy with Holy Roman Emperor
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 to signal the end of the investitureinvestiture,
in feudalism, ceremony by which an overlord transferred a fief to a vassal or by which, in ecclesiastical law, an elected cleric received the pastoral ring and staff (the symbols of spiritual office) signifying the transfer of the office.
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 controversy by confirming the Concordat of Worms (1122). It was held in the Lateran Palace, Rome, making it the first council to be held in Western Europe. Many of the council's decrees became part of the evolving corpus of medieval Latin canon law.
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