Rise The founder of the Tahirid dynasty was
Tahir ibn Husayn, a Sunni
Persian of
dehqan origin, who had played a major military role in the
civil war between the rival caliphs
al-Amin and
al-Ma'mun. He and his ancestors had previously been awarded minor governorships in eastern Khorasan for their service to the Abbasids. In 821, Tahir was made governor of
Khorasan, but he died soon afterwards. The caliph then appointed Tahir's son, Talha, governor of Khorasan. Talha was unsuccessful in removing the Kharijites from Sistan, and following the death of the Kharijite leader, Hamza b. Adarak (d.828), the Tahirids occupied Zarang but never succeeded in collecting taxes in the surrounding countryside. Tahir's other son, Abdullah, was instated as the
wali of
Egypt and the
Arabian Peninsula, and when Talha died in 828 he was given the governorship of
Khorasan. Abdullah is considered one of the greatest of the Tahirid rulers, as his reign witnessed a flourishing of agriculture in his native land of Khorasan, popularity in the eastern lands of the Abbasid caliphate and expanding influence due to his experience with the western parts of the caliphate. A noted poet, he sympathized with all things Arabic. The replacement of the
Pahlavi script with the
Arabic script in order to write the
Persian language was done by the Tahirids in 9th century
Khurasan.
Fall Abdullah died in 844 and was succeeded by his son
Tahir II. Not much is known of Tahir's rule, but the administrative dependency of
Sistan was lost to rebels during his governorship. Tahirid rule began to seriously deteriorate after Tahir's son
Muhammad ibn Tahir became governor, due to his carelessness with the affairs of the state and lack of experience with politics. Oppressive policies in
Tabaristan, another dependency of Khorasan, resulted in the people of that province revolting and declaring their allegiance to the independent
Zaydi ruler
Hasan ibn Zayd in 864. In Khorasan itself, Muhammad's rule continued to grow increasingly weak, and in 873 he was finally overthrown by the
Saffarid dynasty, who annexed Khorasan to their own empire in eastern
Persia. ==Governors of Baghdad==