Ali ibn Yusuf
Ahmad ibn ‘Ali al-Buni (), also called Sharaf al-Din or Shihab al-Din Ahmad ibn Ali ibn Yusuf al-Buni al-Maliki al-ifriqi (born in Annaba, Algeria died 1225) was an Algerian mathematician and philosopher and a well known Sufi and writer on the esoteric value of letters and topics relating to mathematics, "sihr" (sorcery) and spirituality, but very little is known about him. Al-Buni lived in Egypt and learned from many eminent Sufi masters of his time.