Lateran Council, First, 1123, 9th ecumenical council of the Roman Catholic Church, summoned by Pope Calixtus II to signal the end of the investiture 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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