ISLAMIC, 'Abbasid Caliphate. temp. Al-Ma'mun, AH 193-218 / AD 809-833. Dirham (Silver, 23 mm, 3.00 g, 10 h), citing Harthama ibn A'yan al-Balkhi al-Khurasani, Madinat Isbahan, AH 197 = AD 809/10. SICA III, 337. Minor deposits, otherwise, very fine.

Harthama ibn A'yan was a high Khorasani official serving under three different Abbasid caliphs. His career and his life ended when he protested against the increasing influence of the Sahlid family and its most prominent member al-Fadl, as he was executed in 816 by command of al-Ma'mun