Helena, mother of Constantine, AE Follis, struck AD 327-328 at Nikomedia mint.
Obv: FL HELENA AVGVSTA, diademed and draped bust right.
Rev:
SECVRITAS REIPVBLICE / SMHE (in exergue), Securitas standing
left, lowering branch with left hand, raising robe with right hand.
2,44 g, 18 mm.
RIC 218