ターヒル朝
Early Islamic Asadabad was a small but prosperous city in the province of Jebal, surrounded by fertile farmlands that produced cereals, cotton, fruit, and especially honey. These farmlands were irrigated by waters brought down from the Kuh-e Alvand via qanats. In 810-11, during the Fourth Fitna, a battle was fought at Asadabad between the forces of al-Amin and al-Ma'mun, two sons of the Abbasid caliph Harun al-Rashid. Al-Ma'mun's general Taher Dhu'l-Yaminayn, who would later go on to found the Tahirid dynasty of Khorasan, defeated al-Amin's commander Abd-al-Rahman ibn Jabala Abnawi, who was killed in battle. As a result of this battle, al-Ma'mun's forces were able to take control of the entire province of Jebal.