Zayn ad-Din Yusuf ibn Sharaf al-Din

Sheikh Zayn ad-Din Yusuf ibn Sharaf ad-Din also called Zeyneddîn or Zeynedîn was a 14th-century Sunni Muslim scholar, qadi (Islamic judge) and former head of the 'Adawiyya order of Sufism.

Historical biography The lineage of Zayn ad-Din, according to an inscription in his zawiya (Sufi lodge), can be traced back to the Banu Umayya tribe. The inscription states his full lineage as Zayn ad-Din, son of Sharaf ad-Din, son of al-Hasan, son of 'Adi, son of Sakhr, son of 'Adi, son of Musafir, son of Ismail, son of Musa, son of al-Hasan, son of Marwan, son of al-Hakam, son of Umayya. This connects his lineage to not only to the head of the 'Adawi order, Sheikh Adi, but also connects it to the Umayyad Caliphate and subsequently to Umayya, progenitor of the Banu Umayya tribe.

After his father, Sharaf ad-Din ibn al-Hasan was killed in 1258 by the invading Mongols, Zayn ad-Din succeeded him in being the head of the 'Adawiyya Sufi order but later abdicated for his own safety due to the increasing Mongol aggression. He appointed an elder, Fakhr ad-Din ibn 'Adi, as the new head of the order, due to the fact that Fakhr ad-Din had a Mongol wife and hence could minimize Mongol aggression against the order.

He was employed as a qadi during the reign of the Mamluk ruler Qalawun.