 According to some reports, the caliph Al-Ma'mun at first supporting replacing him with Talha's brother Abdallah ibn Tahir al-Khurasani, but the latter was occupied with rebels in Al Jazira, so Talha was confirmed as governor of eastern Iran instead.Talha's rule is mostly known for his campaigns in Sistan, another province under his rule, against the local Kharijites, who were led by a Hamza ibn Adharak.Fighting between the two continued until 828, when both Hamza and Talha died.