Obverse side of a Turkmen copper dirham showing a diademed head within a square. Designed by Nestorian Christian artists, it copies a 4th-century Roman coin showing Constantine the Great looking to the heavens. The Arabic writing surrounding the square gives the genealogy of the ruler for whom the coin was struck; it reads “Ilghaāzī, son of Alpī, son of Timurtash, son of Artuq.” Struck in Mardin, Turkey, AD 1176–84. Diameter 32 mm.