The Fatimite dynasty, of rather doubtful descent, which ruled a part of Northern Africa and Egypt in the tenth century A.D., was completely suppressed after some two and a half centuries. The Sherîfs who have ruled Morocco for more than 950 years were not chiefs of a party that considered the legality of their leadership a dogma; they owe their local Khalifate far more to the out-of-the-way position of their country which prevented Abbasids and Turks from meddling with their affairs. Otherwise, they would have been obliged at any rate to acknowledge the sovereignty of the Great Lord of Constantinople. This was the case with the Sherîfs of Mecca, who ever since the twelfth century have regarded the sacred territory as their domain. Their principality arose out of the general political disturbance and the division of the Mohammedan empire into a number of kingdoms, whose mutual strife prevented them from undertaking military operations in the desert. These Sherîfs raised no claim to the Khalifate; and the Shî'itic tendencies they displayed in the Middle Ages had no political significance, although they had intimate relations with the Zaidites of Southern Arabia. As first Egypt and afterwards Turkey made their protectorate over the holy cities more effective, the princes of Mecca became orthodox. The Zaidites, who settled in Yemen from the ninth century on, are really Shî'ites, although of the most moderate kind. Without striving after expansion outside Arabia, they firmly refuse to give up their own Khalifate and to acknowledge the sovereignty of any non-Alid ruler; the efforts of the Turks to subdue them or to make a compromise with them have had no lasting results. This is the principal obstacle against their being included in the orthodox community, although their admission is defended, even under present circumstances, by many non-political Moslim scholars. The Zaidites are the remnant of the original Arabian Shî'ah, which for centuries has counted adherents in all parts of the Moslim world, and some of whose tenets have penetrated Mohammedan orthodoxy. The almost general veneration of the sayyids and sherîfs, as the descendants of Mohammed are entitled, is due to this influence.