Constantine I AE Follis, 310-312 AD. 

Obv: IMP CONSTANTINVS PF AVG, laureate & cuirassed bust right
Rev: GENIO-POP ROM, Genius standing left, tower on head, draped 
loins, holding patera & cornucopiae; star in right field; 
PLN in ex. 

RIC VI London 209a, rated R2.

Used with permission of TimeLine Originals (www.time-lines.co.uk), June 2009