Abbasid, al-Ma'mun, gold dinar, AH 200, citing al-Hasan [ibn Sahl] and Dhu'l-Ri'asatayn

Abbasid: al-Ma'mun, gold dinar (4.14g), AH 200. Citing the Abbasid governor of Iraq al-Hasan [ibn Sahl] and his brother the vizier Dhu'l-Ri'asatayn.