Constantius I, as Caesar, AE Follis. 301-303 AD. 

Obv: CONSTANTIVS NOB C, laureate cuirassed bust right 
Rev: GENIO POPVLI ROMANI, Genius standing left, with modius on head, 
 chalmys over shoulder, holding patera & cornucopiae, sacrificing over 
 altar to left, B to right, PLG in ex.
Contributed by Mick James, February, 2005.