Caracalla, AE28 of Serdica, Thrace, 

AVT K M AVRH CEVH ANTWNEINOC, laureate head right.
OVLPIAC CERDIKHC, Caracalla on horseback pacing right, 
raising right hand. 

Ruzicka 345; Sofia 4974; Varbanov 2294 (this coin cited)