Investiture Controversy Legal System

Timeline

1. 1000–1074Holy Roman Empire · Holy Roman EmpireImperial monarchs symbolized a bishop's secular territory and administrative subordination by granting the crozier and ring, while bishops served as court advisers and local governors, forming an investiture custom intertwining church office and feudal obligation.
2. 1075Rome · LazioGregory VII at the Roman synod declared lay investiture and simony forbidden, reclaiming the right to appoint bishops to the pope, challenging the legitimacy of the imperial investiture system at the level of canon law.
3. 1076–1077Worms · Rhineland-PalatinateAfter being excommunicated, Henry IV convened bishops at Worms in January 1077 and declared Gregory deposed; the two sides faced off with church excommunication and imperial anti-papal procedures, raising the Investiture Controversy into an open crisis of law and loyalty.
4. 1077–1080Castle of Canossa · Emilia-RomagnaHenry obtained a conditional absolution after three days of penance at Canossa, briefly restoring church communion; by 1080 the two sides broke again, Gregory excommunicated Henry a second time and recognized a rival king, and the investiture dispute entered a phase of armed confrontation.