November 18: edit
- 326 - The old St. Peter's Basilica is consecrated.
- 1095 - The Council of Clermont, called by Pope Urban II to discuss sending the First Crusade to the Holy Land, begins.
- 1302 - Pope Boniface VIII issues the Papal bull Unam sanctam ("The One Holy").
- 1626 - St. Peter's Basilica is consecrated.