Early Medieval & Islamic
ISLAMIC, Abbasid Caliphate Al-Rashid, AH 170-193 / AD 786-809.
AR Dirham (25.4mm 2.9g),
citing the heir apparent Muhammad al-Amin as 'ibn Amir al-Mu'minin' ('son of the Commander of the Faithful' in Kufic) and the vizier Ja'far ibn Yahya al-Barmaki, al-Muhammadiya, AH 180 = AH 796/7.
SICA III, 1398