Gregory VII excommunicates Henry IV again

Timeline

1. 1080Rome · LazioGregory VII announced at the Roman Lenten synod that he was again excommunicating Henry IV, condemning him for breaking his promises after the Canossa reconciliation, continuing to support lay investiture, and persecuting supporters of the church.
2. 1080Rome · LazioAt the same synod, Gregory VII formally recognized the rival king Rudolf as the lawful monarch of the Holy Roman Empire, staking papal authority entirely on the anti-Henry camp and binding the Investiture Controversy completely to the struggle for the German throne.
3. 1080Brixen · Trentino-Alto AdigeHenry IV declared Gregory VII deposed at the Synod of Brixen and installed Bishop Guido as antipope Clement III, plunging the Western Church into a standoff between two popes and escalating the Investiture Controversy into a full church schism.