Constantius I, Chlorus, as Caesar, 293-305 AD.  AE Follis, Herakles Mint.

FL VAL CONSTANTIVS NOB CAES, laureate head right.
GENIO POPVLI ROMANI, Genius standing left with modius on head
and chlamys over shoulder, holding cornucopia and patera from 
which liquid flows.

HTB in exergue.

RIC VI Heraclea 20a.

With permission of Helios Auction 5, June 2010, lot 437.
Added in Aug. 2011.