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

IMP DIOCLETIANVS 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 306a.

With permission of Roma Numismatics, Oktober, 2009