Magnentius Emperor (usurper) of the Roman Empire from 350 to 353.
Flavius Magnus Magnentius Augustus was a usurper of the Roman Empire from 350 to 353.

Born in Samarobriva (Amiens), Gaul, Magnentius was the commander of the Imperial guard units. When the army grew dissatisfied with the behavior of Roman Emperor Constans, it elevated Magnentius. Constans was abandoned by all except a handful of retainers, and he was slain shortly afterwards by a troop of light cavalry near the Pyrenees.

While Magnentius received the support og Britannia, Hispania and Gaul, Emperor Constantius II would have none of it and marched to battle. After a series of defeats Magnentius fell on his sword in 353.
Magnentius
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An AE Maiorina struck 351-352 AD in Treveri
Obverse: D N MAGNEN–TIVS P F AVG, Draped and cuirassed bust right, A behind

Reverse: VICTORIAE DD NN AVG ET CAES, two Victories standing facing, one another, holding round shield inscribed VOT V MVLT X in four lines. No column.

Diameter: 0 mm
Die Orientation: 0 H
Weight: 0 g
No notes for this coin
RIC 312
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An AE Maiorina struck 350-352 A.D. in Rome
Obverse: DN MAGNEN-TIVS PF AVG, bare-headed, draped, cuirassed bust right, A behind head.

Reverse: GLORIA ROMANORVM, emperor on horseback galloping right, no shield, wielding spear at a bare-headed enemy half- kneeling before the horse, broken spear and shield beneath the horse. Star in upper right field.

Diameter: 23 mm
Die Orientation: 0 H
Weight: 5 g

35 Mintmark R epsilon.

RIC VIII Rome 197
(3) Magnentius
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An AE Centenionalis struck 350-353 A.D. in Arelatum
Obverse: D N MAGNENTIVS P F AVG / A. Bare-headed, draped and cuirassed bust right.

Reverse: VICTORIAE DD NN AVG ET CAES / F / PAR. Two Victories standing facing each other, holding between them wreath inscribed VOT / V / MVLT / X in four lines.

Diameter: 22 mm
Die Orientation: -
Weight: 4.07 g
No notes for this coin
RIC 173
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An AE Centenionalis struck 350 - 353 AD in Trier
Obverse: DN MAGNEN-TIVS PF AVG / bare-headed, draped, cuirassed bust right, A behind bust

Reverse: VICTORIAE DD NN AVG ET CAES / two Victories standing facing each other, holding between them a wreath inscribed VOT-V-MVLT-X. Mintmark TRP

Diameter: -
Die Orientation: -
Weight: -
No notes for this coin
RIC VIII Trier 316A, Rare (R2)
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An AE Maiorina struck 350-353 AD in Treveri
Obverse: draped and cuirassed bust right; IM CAE MAGN_ENTIVS AVG

Reverse: Magnentius standing half left, holding Victory on globe and labarum; FELICITAS__REIPVBLICE / A / TRS

Diameter: 21 mm
Die Orientation: -
Weight: 4.9 g
19 Jan 350 - 18 Aug 353 AD
RIC 264 of Trier, Cohen 5.
/Files/Images/Coinsite/CoinDB/760_Magnentius_RP.jpg
An AE Maiorina struck 350-351 AD in Rome
Obverse: draped and cuirassed bust right; D N MAGNEN_TIVS P F AVG / B

Reverse: two Victories holding shield inscribed VOT / V / MVLT / X; VICT DD NN AVG ET CAES / * / R P

Diameter: 23 mm
Die Orientation: -
Weight: 4.4 g
30.6.350 - spring 351 AD
RIC VIII Rome 216
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An AE Follis struck 350-353 AD in Treveri
Obverse: Magnentius

Reverse: Magnentius standing on galley

Diameter: 21.5 mm
Die Orientation: -
Weight: 4.05 g
No notes for this coin
No references provided for this coin
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An AE Centenionalis struck AD 352 in Treveri
Obverse: D N MAGNENTIVS P F AVG, draped and cuirassed bust right; A behind

Reverse: VICTORIAE DD NN AVG ET CAES, two Victories holding wreath inscribed VOT V MVLT X in four lines; TRP in exergue

Diameter: 22 mm
Die Orientation: 11 H
Weight: 4.9 g
In terms of double chins, this is probably the best in my collection. Ebay auction (Den of Antiquity; 11.07.16). A bargain at £23!
RIC 312; Sear 18825