Ibrāhīm ibn al-Mahdī (Arabic: إبراهيم بن المهدي; 779–839) was an Abbasid prince, singer, composer and poet. He was the son of the third Abbasid caliph, al-Mahdi, and the half-brother of the poet and musician Ulayya. Ibrahim was contemporary of Abbasid caliph al-Hadi, al-Rashid and his three nephews caliph al-Amin, al-Ma'mun, al-Mu'tasim.
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Biography
Ibrahim was born in 779. He was the son of Abbasid caliph al-Mahdi, and was born during the Caliphate of his father. His mother was Shaklah, whose father was Khwanadan, steward of Masmughan. She had a brother named Humayd. She was acquired by Al-Mahdi when she was a child. He presented her to his concubine Muhayyat, who, discovering a musical talent in the child, sent her to the famous school of Taif in the Hijaz for a thorough musical education. Years later Al-Mahdi, then caliph, took her as his concubine.
One of his wives was Umm Muhammad. She was the daughter of Salih al-Miskin and Umm Abdullah bint Isa ibn Ali. After Ibrahim divorced her, she married Harun al-Rashid.
During the Fourth Fitna, Ibrahim was proclaimed caliph on 20 July 817 by the people of Baghdad, who gave him the regnal name of al-Mubarak (Arabic: المبارك) and declared his reigning nephew al-Ma'mun deposed. Ibrahim received the allegiance of the Hashemites. He had to resign in 819, and spent the rest of his life as a poet and a musician. He is remembered as "one of the most gifted musicians of his day, with a phenomenal vocal range", and a promoter of the then innovative 'Persian style' of song, 'which was characterized inter alia by redundant improvisation'.
Ibrahim died in 839 during the Caliphate of his younger nephew al-Mu'tasim.
Culinary interests
Ibn al-Mahdi has been described by historians as a "gourmet prince". He authored what is possibly the first Arabic language cookbook, kitab al-tabikh. The book is referenced in Ibn Sayyar al-Warraq's kitab al-tabikh, with many recipes credited to him. Ibn al-Mahdi also composed poetry about various dishes. Nearly 10th of Ibn Sayyar's non-medicinal recipes were contributed by ibn al-Mahdi.
Siblings
Ibrahim was related to several Abbasid caliphs. He was also contemporary to several Abbasid caliphs, princess and princesses. Ibrahim was at one point married to Abbasid princess Umm Muhammad.



