Cairo is the capital of the Arab Republic of Egypt and the largest and most important cities , the largest Arab city in terms of population and theater, and occupies the first place in the world in terms of population. Cairo is one of the most diverse cities. The history of the city to the origin of the city of En Pharaonic in 641 in the city of Fustat, and then the establishment of the Abbasids of the city of the military, the construction of Ahmed Ibn Tulun city of Qataeim, and with the entry of the Fatimids Egypt from the African (Tunisia now) in the construction of the new capital of the Fatimid order of the Caliph In 969.