Caracalla, AE31 of Serdica, Thrace. AVT K M AVP CEVH ANTWNEINOC, laureate head right. OVLPIAC CERDIKHC, Apollo Iatros, bearded, naked, standing front, looking left, resting on serpent-entwined staff in left hand and resting right hand on hip. Ruzicka 167; Varbanov 2151 (this coin).