Arabic inscriptions: "There is no God except Allah alone. He has no partner" in the central field, "In the name of Allah this dirhem was struck at Samarqand in the year one hundred ninety nine" in the margins / "Allah is one, Allah is eternal. He begets not neither is he begotten" in the central field, "Mohamed is the prophet of Allah whom he sent with guidance and the religion of truth that he may make it victorious over every other religion". 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
I n 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.