Zu al-Nun al-Misri

Dhūl-Nūn Abū l-Fayḍ Thawbān b. Ibrāhīm al-Miṣrī (Arabic: ذو النون المصري‎‎; d. Giza, in 245/859 or 248/862), often referred to as Dhūl-Nūn al-Miṣrī or Zūl-Nūn al-Miṣrī for short, was an early Egyptian Muslim mystic and ascetic of Nubian origin. Born in Upper Egypt in 796, Dhul-Nun is said to have made some study of the scholastic disciplines of alchemy, medicine, and Greek philosophy in his early life, before coming under the mentorship of the mystic Saʿdūn of Cairo, who is described in traditional accounts of Dhul-Nun's life as both "his teacher and spiritual director." Celebrated for his legendary wisdom both in his own life and by later Islamic thinkers, Dhul-Nun has been venerated in traditional Sunni Islam as one of the greatest saints of the early era of Sufism.

It has been speculated by scholars whether "Dhul-Nun" was an honorific (laqab) for the mystic rather than his name proper, which is sometimes believed to be Thawbān. As "Dhul-Nun," literally meaning "the one of the fish [or whale]," is another name for the Hebrew prophet Jonah in Islamic tradition, it is sometimes believed that this title was given to Dhul-Nun in commemoration of Jonah.

Dhul-Nun is one of the most prominent saints of early Islamic tradition, appearing "in the earliest accounts of Ṣūfism as the leading figure of his generation." Often depicted as the spiritual master of Sahl al-Tustari (c. 818-896), the traditional hagiographies relate that the latter refused to engage in mystical discourse until after Dhul-Nun's death, on account of his recognition of Dhul-Nun's elevated rank in wisdom and gnosis.

...
Wikipedia