 Abu Yaqub al-Mustansir Yusuf II Caliph of Maghreb from 1213 until his death.The son of the previous caliph, Muhammad an-Nasir, Yusuf assumed the throne following his father's death, at the age of only 16 years.Al-Busiri (1211–1294) was a Sanhaja Berber Sufi poet belonging to the Shadhiliyya order being direct disciple of Sheikh Abul Abbas al-Mursi.