Ubaydallah ibn Abdallah ibn Tahir was the last major Tahirid to hold high office in what dynasty?
Ubaydallah ibn Abdallah ibn Tahir Abu Ahmad Ubaydallah ibn Abdallah ibn Tahir (Arabic: أبو أحمد عبيد الله بن عبد الله بن طاهر‎ ‎ , ca. 838 – May 913) was a ninth century Tahirid official and military officer. He was the last major Tahirid to hold high office, having served as the governor of Baghdad at various points between 867 and 891.
Abdallah ibn Amir Abdallah ibn Amir (Arabic: عبدالله بن عامر‎ ‎ ) was a governor of Busra (647–656) and an extremely successful military general during the reign of Rashidun Caliph Uthman ibn Affan. His father was a maternal uncle of Caliph Uthman. Abdallah was thus a cousin of Uthman. He is well known for his administrative and military prowess. his campaign of Reconquest and pacifying the large soils of Persian Empire former territories has left great legacy of Islamization in both Iran and Afghan land