Diocletian. AE Follis. 294 AD. 

Obv: IMP C DIOCLETIANVS P AVG, laureate head right
Rev: GENIO POPV-LI ROMANI, Genius standing left, modius on head, 
naked except for chlamys over left shoulder, holding patera and
 cornucopiae. 

Mintmark TR. 

RIC VI Trier 139a rated Scarce.

With permission of Roma Numismatics, October, 2009