Arabic inscriptions on both sides, citing al-Mashrek in the lower field on obverse and Zul Riyasatayn in the lower field on the reberse. Minted in 199 AH = 814 AD, mint of Sanarqand. 23mm, 2.71 grams. A223.4; Lavoix 911. SKU X7051-T312-Q569-42538

I 802 Harun al-Rashid, father of al-Ma'mun and al-Amin, ordered that al-Amin succeed him and al-Ma'mun serve as governor of Khurasan and as caliph after the death of al-Amin After al-Rashid's death in 809, the relationship between the two brothers deteriorated. In response to al-Ma'mun's moves toward independence, al-Amin declared his own son Musa to be his heir. This violation of al-Rashid's testament led to a civil war in which al-Ma'mun's newly recruited Khurasani troops, led by Tahir bin Husain (d. 822), defeated al-Amin's armies and laid siege to Baghdad. In 813, al-Amin was beheaded and al-Ma'mun recognized as caliph throughout the empire. 

This coin is unconditionally guaranteed to be authentic.