The Second Siege of Gibraltar was an abortive attempt in 1315 by the Nasrid Moors of the Emirate of Granada to recapture Gibraltar, which had fallen to the forces of Ferdinand IV of Castille four years previously in 1309. The siege was precipitated by the overthrow in 1314 of Nasr, Sultan of Granada by his nephew Ismail. The new sultan declared jihad against the Christian rulers of the Iberian Peninsula in 1315 and moved to establish a siege against Gibraltar.