Diocletian, AE Antoninianus, Rome. AD 291. 23 mm, 4.24 g.

IMP DIOCLETIANVS AVG, radiate, draped and cuirassed bust right.
VIRTVS AVGG, Hercules, standing front, looking left, holding club and trophy.

Mintmark XXI Gamma (Possible mintmarks XXIA to XXIZ and XX crescent IZ.

RIC V-2, 184; Paris AF13449; Cohen 500.

Courtesy of the Bibliotheque Nationale, Paris, gallica.bnf.fr.