Constantine I (307/310-337) AE Follis (Bronze, 2.80g, 18mm) Rome, 320.
Obv: CONST-ANTINVS AVG, Cuirassed bust of Constantine I to right, wearing crested and decorated helmet.
Rev: ROMAE AETERNAE / R ЄⲰC T, Roma seated right on shield set on ground, inscribing with her right hand shield set on her knees with X/V in two lines.
Ref: RIC 194.