Helena, mother of Constantine I (Augusta 324-330).     AE Follis, Treveri (Trier) mint, struck under Constantine I, 326 AD.   Obv.    FL HELENA AVGVSTA. Diademed and mantled bust right, wearing necklace.        Rev.   SECVRITAS REIPVBLICE: Securitas standing facing, head left, holding olive branch and lifting dress; in exergue, STR-pellet-in-crescent.     RIC VIII 481.     3.17 g.   19.00 mm.          VF.