Audita tremendi was a papal bull issued by Pope Gregory VIII on October 29, 1187, calling for the Third Crusade. It was issued just days after Gregory had succeeded Urban III as pope, in response to the defeat of the Kingdom of Jerusalem at the Battle of Hattin on July 4 of 1187. Jerusalem itself had fallen to Saladin on October 2 (see Siege of Jerusalem), but news of this had not yet reached Europe by the time the bull was issued at the end of the month.