ISLAMIC COINS. ABBASID CALIPHATE. al-Ma'mun (104-218h) / Tahir, Gold Dinar, no mint name 198h, rev inner margin: mimma amira bihi 'Abd Allah 'Abd Allah amir al-mu'minin ("among those things ordered by the servant of God 'Abd Allah (al-Ma'mun), Commander of the Faithful"), field fourth line: Tahir, 4.12g (Bern 87, four references; A 222.6T). Full flan, very fine and rare.
Tahir bin al-Husayn was the general in command of the caliphal troops at Madinat al-Salam in the closing year of al-Amin's reign. This coin was presumably struck in the city's mint after the defeat or death of al-Amin in 198h. It should be noted that Tahir does not give al-Ma'mun his caliphal name but only his personal name, 'Abd Allah, in the inner marginal legend on the reverse of this Dinar. Tahir was the founder of the Tahirid dynasty of semi-independent governors of Central Asia and this coin provides evidence of his lukewarm loyalty to the Abbasid dynasty.
Estimate: £4000-5000