Events The Domesday Book is completed in England. Emperor Shirakawa of Japan starts his cloistered rule. The Imam Ali Mosque in Najaf is rebuilt by the Seljuk Malik Shah I after being destroyed by fire. May 24—Pope Victor III succeeds Pope Gregory VII as the 158th pope, though he doesn't accept election until May 9, 1087. October 23 – Battle of az-Zallaqah: Alfonso VI of León and Castile is defeated by the Almoravids, who had been called into Spain by Abbad III of Sevilla. Deat… (More on 1086)