Diocletian. AE Follis. Trier. 295 AD. 

IMP DIOCLETIANVS P 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 in left field. 
Mintmark TR. RIC VI Trier 152a var. 

RIC lists only laureate head right for this issue from Trier with no mark in the right field. Rare.

With permission of Roma Numismatics, Apr. 2010