Antipope Clement III crowns German emperor Henry IV. Clement becomes an important figure in the conflicts between Holy Roman Emperor Henry IV and the popes over investiture.
Elevated to Archbishop of Ravenna against the wishes of Pope Alexander II, Clement had taken take Henry's side against Alexander's successor Pope Gregory VII.
Clement was the chief opponent of the Gregorian Reforms to the priesthood, specifically Gregory's goal of ending clerical concubinage, ending clerical simony, and ejecting from the clergy any priests who persisted in keeping concubines.
In April 1076 opponents of Pope Gregory VII met and excommunicated him. Gregory then excommunicated Giberto. In 1080, Henry VI made Giberto pope but he receives no support outside Henry's circle of influence.