Untitled Document1221, Byzantine Empire, John III Ducas. Gold Hyperpyron CoinReferences: SB 2073. Mint Period: 1222-1254 Mint Place: Constantinople Denomination: Gold Hyperpyron Emperor: John III Ducas VatatzesDiameter: 29mm Weight: 4.38gm Material: Gold! Obverse: John III standing facing on the left, wearing divitision and loros, holding anexikakia in his left hand and labarum in his r ...