Gratian Emperor of the Roman Empire from 367 to 388.
Flavius Gratianus Augustus was Roman emperor from 367 to 383.

He was the son of Emperor Valentinian I by Marina Severa, and was born at Sirmium. He ruled alongside his father from 367 to 375, alongside his brother Valentinian II from 375 to 379, and finally alongside Theodosius I from 379 to 383, as Augustus in the west.

By using foreign bodyguards, and appearing in public in the dress of a Scythian warrior, he aroused the contempt and resentment of his Roman troops. A Roman general named Magnus Maximus took advantage of this feeling to invade Gaul with a large army. Gratian was deserted by his troops, and fled from Paris to Lyon. The governor of Lyon delivered Gratian to one of the rebel generals, Andragathius, and he was assassinated on 25 August 383.
Gratian
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An AE Half-Centenionalis struck 383 AD in an unknown location
Obverse: DN GRATIANVS PF AVG

Reverse: VOT XX MVLT XXX, in four lines within wreath

Diameter: 12 mm
Die Orientation: 6 H
Weight: 1.3 g
No notes for this coin
Sear 20158ff
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An AR Siliqua struck 367-375 in Treveri
Obverse: Draped Bust right "DN GRATIANVS P F AVG"

Reverse: Roma seated facing on throne, looking left, holding Victory on globe and spear, left leg bare "VIRTVS ROMANORVM"

Diameter: 16 mm
Die Orientation: 0 H
Weight: 1.5 g
No notes for this coin
RIC 58a
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An AE Centenionalis struck 367-375 AD in Siscia
Obverse: pearl-diademed, draped and cuirassed bust right; D N GRATIANVS P F AVG

Reverse: Valens advancing right, dragging captive and holding labarum; GLORIA RO_MANORVM / M _ * above P / ΔSISC

Diameter: 18 mm
Die Orientation: -
Weight: 2.46 g
24.8.367 - 17.11.375 AD
RIC IX Siscia 14c, type xvii
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An AE Maiorina struck 378-383 AD in Arelatum
Obverse: pearl-diademed, draped and cuirassed bust right; D N GRATIA_NVS P F AVG

Reverse: Gratian standing front, head left, holding Victory on globe and raising kneeling female on left; REPARATIO__REIPVB / PCON

Diameter: -
Die Orientation: -
Weight: 3.6 g
9.8.378 - 25.8.383 AD
RIC IX Arles 20a
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An AE unit struck 367-375 in Siscia
Obverse: DN GRATIANVS PF AVG, pearl-diademed, draped, and cuirassed bust right

Reverse: [G]LORIA RO-MANORVM, Emperor in military dress, walking right, head left, holding labarum, dragging captive behind him. Left field: S over dot, right field: C over hooked A (SYM 4)

Diameter: 18 mm
Die Orientation: -
Weight: 1.8 g
Mintmark: ΔSISCA
RIC 14c type xxxviii
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An AR Siliqua struck 375-378 in Aquileia
Obverse: DN GRATIANVS PF AVG, pearl-diademed, draped and cuirassed bust right

Reverse: RBS ROMA, Roma seated left on cuirass, holding Victory on globe and reversed spear

Diameter: 13 mm
Die Orientation: -
Weight: 1 g
No notes for this coin
RIC 15b
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An AR Siliqua struck AD 378-383 in Treveri
Obverse: D N GRATIANVS P F AVG, pearl-diademed, draped and cuirassed bust right

Reverse: VRBS ROMA, Roma seated left on cuirass, holding Victory on globe and resting on reverse spear

Diameter: 18 mm
Die Orientation: 6 H
Weight: 1.93 g
Gratian was just seven years old when his father, Valentinian I, made him co-emperor of the western Roman empire. Following the sudden death of his father, Gratian, now sixteen, found himself solely in charge. He was an early supporter of Christianity and did his best to stamp out old Pagan traditions wherever possible. This beautiful siliqua was minted in Augusta Treverorum (modern day Trier in Germany), which was operational from around AD 291. On the reverse, under the figure of Roma, we can see the mintmark TR for Trier. This is followed by PS, for pusulatum, and indicates that the metal is refined silver. Over time the coin has toned and developed a stunning rainbow-like iridescence. Ex. Naville Numismatics, Auction 32; Lot 584
RIC 64a; C 87; Sear 19966