In 644 at Madinah , Caliph Umar ( Omar ) was succeeded Change_of_leadership by Uthman ibn Affan ( Othman ) , during whose twelve-year rule Armenia , Cyprus , and all of Iran , would be added Cause_to_be_included to the growing Expansion Islamic empire ; Afghanistan and North Africa would receive Receiving major invasions Attack ; and Muslim sea raids Attack would range Cause_to_be_included from Rhodes to the southern coasts of the Iberian Peninsula .