Helena, mother of Constantine I. AE Follis, 326-328 AD. Thessalonica mint. Obv. FL HELENA AVGVSTA. Diademed and draped bust right. Rev. SECVRITAS REI PVBLICE. Empress standing left, lowering branch, raising robe; in exergue, SMTSΓ. RIC 159. AE. g. 2.28 mm. 19.00 About EF.