546 Gothic War: The Ostrogoths of King Totila conquered Rome by bribing the Byzantine garrison.
920 Romanos I was crowned co-emperor of the underage Emperor Constantine VII.
1187 Pope Gregory VIII died. In his brief pontificate, Gregory initiated the Third Crusade and began reforms in the Curia.
1531 Pope Clement VII established a parallel body to the Inquisition in Lisbon, Portugal.
1538 Pope Paul III excommunicated Henry VIII of England.