Herakles - DIADUMENIAN AE 21 Caesarea SERAPIS $22.25 (reserve not met) Apr-25-01 Roman Empire. Diadumenian. A.D. 218. AE 21 mm. 8.20 grams. Struck in Caesarea. Obverse: His laureate and draped bust r. Reverse: Bust of Serapis r., wearing kalathos. Rosenberger 67. Good Very Fine.