 After about 1070, the Fatimid hold on the Levant coast and parts of Syria was challenged first by Turkic invasions, then the Crusades, so that Fatimid territory shrank until it consisted only of Egypt.The Fatimids gradually lost the Emirate of Sicily over thirty years to the Italo-Norman Roger I who was in total control of the entire island by 1091.The reliance on the Iqta system also ate into Fatimid central authority, as more and more the military officers at the further ends of the empire became semi-independent.