SASSANIAN EMPIRE. Shahpur I, A.D. 240-272. AR Drachm, (28mm, 3.49 g) Mint I ("Ctesiphon"), ca. A.D. 260-272. Obverse: Bust of Shahpur I right, wearing diadem and mural crown with korymbos; Reverse: Fire altar flanked by two attendants wearing mural crowns.