Ali ibn Yusuf
Abu Nasr Sa'd ibn Ali ibn Yusuf (), known by the regnal name al-Musta'in bi-llah () and as Ciriza (a corruption of "Sidi Sa'd") or Mulay Zad ("Lord Sa'd) to the Christian chroniclers, was the twentieth Nasrid ruler of the Moorish Emirate of Granada in Al-Andalus on the Iberian Peninsula.