Nasrid dynasty
To traditional and modern historians, Nasr's abdication in favour of Ismail I marked the end of "al-dawla al-ghalibiyya al-nasriyya", "the Nasrid dynasty of al-Ghalib", whose rulers are patrilineally descended from Muhammad I—also known by the epithet "al-Ghalib billah"—and the beginning of a new branch: "al-dawla al-isma'iliyya al-nasriyya", "the Nasrid dynasty of Ismail". The Nasrid dynasty did not have a specific rule of succession, but Ismail I was the first of the few rulers who only descended matrilineally from the royal line. The other instance happened in 1432 with the accession of Yusuf IV.