Al-Mubarrad () (al-Mobarrad), or Abū al-‘Abbās Muḥammad ibn Yazīd (c. 826c. 898), was a native of Baṣrah. He was a philologist, biographer and a leading grammarian of the School of Basra, a rival to the School of Kufa. In 860 he was called to the court of the Abbasid caliph al-Mutawakkil at Samarra. When the caliph was killed the following year, he went to Baghdād, and taught there until his death. A prolific writer, perhaps the greatest of his school, his best known work is Al-Kāmil ("The Perfect One" or "The Complete"). A leading scholar of Sībawayh's seminal treatise on grammar, "al-Kitab" ("The Book"), he lectured on philology and wrote critical treatises on linguistics and Quranic exegesis (tafsir). He is said to be the source of the story of Shahrbanu or Shahr Banu — eldest daughter of Yazdegerd III. His quote to would-be students was: “Have you ridden through grammar, appreciating its vastness and meeting with the difficulties of its contents?" Biography Ishaq Al-Nadīm transmitted the written account of Abū al-Ḥusayn al-Khazzāz, who gives al-Mubarrad's full genealogical name: Muḥammad ibn Yazīd ibn ‘Abd al-Akbar ibn ‘Umayr ibn Ḥasanān ibn Sulaym ibn Sa‘d ibn ‘Abd Allāh ibn Durayd ibn Mālik ibn al-Ḥārith ibn ‘Āmir ibn Abd Allāh ibn Bilāl ibn ‘Awf ibn Aslam ibn Aḥjan ibn Ka‘b ibn al-Ḥarīth ibn Ka‘b ibn ‘Abd Allāh ibn Mālik ibn Naṣr ibn al-Azd, al-Azd said to be the son of al-Ghawth. According to Sheikh Abū Sa‘īd al-Sīrāfī, Abū al-‘Abbās Muḥammad ibn Yazīd al-Azdī al-Thumālī [al-Mubarrad] was a protégé of the grammarians al-Jarmī, al-Māzinī, etc. He was descended from a branch of al-Azd, called the Thumālah. He began studying Sībawayh's Book with al-Jarmī, but completed it with al-Māzinī, whose linguistic theories he developed. In a citation from the book called Device of the Men of Letters, al-Hakimi wrote that Abū ‘Abd Allah Muhammad ibn al-Qāsim called Al-Mubarrad a "Sūraḥūn", of al-Baṣrah. His origins were in al-Yaman, however his marriage to a daughter of al-Ḥafṣā al-Mughannī earned him the name ‘Ḥayyan al-Sūraḥī.’ Abū Sa’īd reports al-Sarrāj and Abū ‘Ali al-Ṣaffār that al-Mubarrad was born in 825-26 (210 AH)and died in 898-99 (285 AH), aged seventy-nine. Others said his birth was in 822-23 (207 AH). Al-Ṣūlī Abū Bakr Muhammad ibn Yahya said he was buried in the cemetery of the Kūfah Gate. Al-Mubarrad related many anecdotes of the poets, linguists and satirists of his circle. In one