Constantine I The Great (307/10-337) AE Follis (Bronze, 1.81g, 14mm) Alexandria, Commemorative series.
Obv: VRBS ROMA. Helmeted and mantled bust of Roma left. Rev: Lupa Romana standing left, head lowered, suckling the twins Romulus and Remus; above, two stars between S - R; SMALA.
Ref: RIC 8.