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Abu ’l-Ḥasan ʿAlī b. ʿĪsā b. ʿAlī b. ʿAbd Allāh al-Rummānī (أبو الحسن علي بن عيسى بن عبد الله الرماني) (296 AH / 909 CE - 384 / 994) was a Muʿtazilī exegete, philosopher, and grammarian. He was renowned for his knowledge of fiqh, kalām, and astronomy. He was a prolific author known for synthesizing the study of grammar and logic. Abū al-Ḥayyān al-Tawḥīdī was among his students.

Life
Al-Rummānī was born in 296 AH/909 CE. His lineage traces back to Samara. There is disagreement about the place of his birth, but it is known that he grew up in Baghdad. He studied grammar under al-Zajjāj, Arabic under Ibn Durayd, religion and creed under the Muʿtazilite Ibn al-Ikhshīd. He is considered one of the most prominent members of the Baghdad school of Arabic grammar.

He is known for his distinctive approach to the study of grammar, which he infused with philosophy and logic. He is also famous for his exegesis of the Qurʾān. He died on 11 Jumādā al-Ulā 384 AH/994 CE at the age of 85 during the reign of Caliph al-Qādir Billāh.