time and that he was the Mahdi whom Moslems must await. But in about A.D. 873 an intriguer of extraordinary subtlety succeeded in capturing the movement, which, hitherto merely schismatic, now became definitely subversive, not only of Islamism, but of all religious belief.
This man, Abdullah ibn Maymūn, the son of a learned and free-thinking doctor in Southern Persia, brought up in the doctrines of Gnostic Dualism and profoundly versed in all religions, was in reality, like his father, a pure materialist. By professing adherence to the creed of orthodox Shi-ism, and proclaiming a knowledge of the mystic doctrines which the Ismailis believed to have descended through Ismail to his son Mohammed, Abdullah succeeded in placing himself at the head of the Ismailis.
His advocacy of Ismail was