Diocletian. AE Follis. Trier. 298-299 AD. 

IMP DIOCLETIANVS PF AVG, laureate, cuirassed bust right

GENIO POPV-LI ROMANI, Genius standing left, modius on head, 
naked except for chlamys over left shoulder, holding patera 
and cornucopiae. 

A-star across fields. 

Mintmark TR. 

RIC VI Trier 278a. 

Courtesy of Roma Numismatics, May, 2010