March 18, 386: Cyril, bishop of Jerusalem from 315, dies. Best known for his series of discourses given during Lent for those to be baptized on Easter, he early on advocated the veneration of relics and argued for transubstantiation—the doctrine that the bread and wine of Communion become the actual body and blood of Christ.

March 18, 1123: The First Lateran Council opens in Rome. Convoked by Callistus II, it repeated and confirmed earlier decrees. The Western church, however, remembers its ...

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