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The administrative machinery of the autonomous Tahirid dynasty of Khurasan is almost unknown, except that their treasury was located in their capital of Nishapur. Ya'qub al-Saffar (r. 867–879), the founder of the Saffarid dynasty who supplanted the Tahirids, is known to have had a bureau of the army ("dīwān al-ʿarḍ") for keeping the lists and supervising the payment of the troops, at his capital Zarang. Under his successor Amr ibn al-Layth (r. 879–901) there were two further treasuries, the "māl-e khāṣṣa", and an unnamed bureau under the chief secretary corresponding to a chancery ("dīwān al-rasāʾil" or "dīwān al-inshāʾ").