Baldwin I of Jerusalem captured Beirut from the Fatimid Caliphate with the help of a Genoese fleet. Siege of Beirut (1110): The siege of Beirut in 1110 occurred in the aftermath of the First Crusade. The coastal city of Beirut was captured from the Fatimids by the forces of Baldwin I of Jerusalem on 13 May 1110, with the assistance of Bertrand of Toulouse and a Genoese fleet. May 13, 1110. Wiki link