ĀBĪ, ʿEZZ-AL-DĪN ḤASAN B. ABŪ ṬĀLEB YŪSOFĪ, Imami faqīh (jurist) of the 7th/13th century, well-known under the nicknames of Fāżel-e Ābī and Ebn al-Zaynab. He was a pupil of Moḥaqqeq Ḥellī, with whom he held disputations on topics of Shiʿite law. He wrote a commentary on his master’s Moḵtaṣar-e nāfeʿ entitled Kašf al-romūz; its colophon bears the date 672/1273-74. He is credited with a certain individuality in his interpretation of canon law (feqh). Among the positions ascribed to him is a condemnation of the practice of having more than canonical four wives, even if this was done by recourse to moṭʿa (i.e., temporary or term marriage, or, more generally, concubinage).