Helena - Augusta of Imperium Romanum from 325 to 330
Flavia Iulia Helena Augusta was an Empress of the Roman Empire, and mother of Emperor Constantine the Great.

Born in Drepana, Bithynia in Asia Minor, she became the consort of the future Roman Emperor Constantius Chlorus and the mother of the future Emperor Constantine the Great. She ranks as an important figure in the history of Christianity and of the world due to her major influence on her son.

In her final years, she made a religious tour of Syria Palaestina and Jerusalem, during which she allegedly discovered the True Cross.

Helena died around 330, with her son at her side.
Helena
Empress Helena of the Roman Empire

(1) Helena 326-328 AD
Obverse: FL HELENA AVGVSTA
Reverse: SECVRITAS-REIPVBLICE, Securitas, standing left, lowering branch and raising hem of robe
Ref: None provided
(2) Helena 337-340 AD
Obverse: FL IVL HELENAE AVG, draped bust of Helena right, her hair elaborately dressed
Reverse: PAX PVBLICA, Pax standing left holding olive branch
Ref: Sear 17498
(3) Helena 337-340 AD
Obverse: diademed and draped bust right; FL IVL HE_LENAE AVG
Reverse: Pax standing half left, holding branch pointing left and long scepter; PA_X PV-BLICA / TRP branch
Ref: RIC VIII Trier 90
(4) Helena 326 AD
Obverse: diademed, draped bust right; FL HELENA__AVGVTA
Reverse: Securitas standing left, holding branch; SECVRITAS__REIPVBLICE; S crescent T
Ref: RIC VII Ticinum 202; Sear 16603
(5) Helena 337-340 AD
Obverse: diademed, draped bust right; FL IVL HE_LENAE AVG
Reverse: Pax standing left, holding branch and scepter; PA_X PV_BLICA / ?TRP?
Ref: RIC VIII Trier (47, 55, 63, 78, 90)
(6) Helena 337-340 AD
Obverse: draped bust right with broad diadem; FL IVL HELE_NAE AVG
Reverse: Pax standing left, holding branch and scepter; PA_X PV_BLICA· / CONSE
Ref: RIC VIII Constantinople 35