As a mere boy he distinguished himself by being one of the first to declare his adhesion to the cause of Mahomet, who some years afterwards gave him his daughter Fatima in marriage.
His descendants by Fatima are known as the Fatimites (q.v.; see also Egypt: History, Mahommedan period).
He was believed to have descended in direct line from Ali by his wife Fatima, the daughter of the Prophet Mahomet.
The hereditary principle had not been recognized by Islam in the cases of Abu Bekr, Omar and Othman; it had had some influence upon the choice of Ali, the husband of Fatima and the cousin of the Prophet.
SAYAD, a descendant of Ali, the son-in-law of Mahomet, by Fatima, Mahomet's daughter.