Nasrid dynasty
Ismail I was succeeded by his son MuhammadIV (r. 1315–1333), a boy of ten. Another son of Ismail succeeded MuhammadIV as YusufI (r. 1333–1354). The lineage of sultans beginning with Ismail is now called "al-dawla al-isma'iliyya al-nasriyya", "the Nasrid dynasty of Ismail", in contrast to "al-dawla al-ghalibiyya al-nasriyya", "the Nasrid dynasty of al-Ghalib", named after MuhammadI's nickname al-Ghalib billah ("The Victor by the Grace of God") and to which the first four sultans belonged. The Nasrid dynasty did not have a specific rule of succession, but IsmailI was the first of the few rulers who descended matrilineally from the royal line. The other instance happened in 1432 with the accession of YusufIV.