Al-Tuwal

Al-Ṭuwāl the Grammarian (الطُّوال النحوّى), surnamed Abū ‘Abd Allāh (أبوعبد الله), or Muḥammad ibn Aḥmad ibn ‘Abd Allāh (محمد بن أحمد بن عبد الله). Al-Ṭuwal the Grammarian was a ninth-century philologist of the School of Kūfah.

Life
He was a disciple of al-Kisā’ī and attended the lectures of al-Aṣma’ī. He moved to Baghdād where Abū 'Umar al-Durī al-Muqrī (أبو عمرو الدّورىّ المقرئ) was his disciple ('hearer'). Abū al-Abbās Tha’lab (أبو العباس ثعلب) said he was a skillful analyst of Arabic grammar. No books of his are known. He died in 857-858 (243 AH).