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This is a nice ancient Roman silver Siliqua of emperor Gratian dating to 367 - 375AD.
Obverse: DN GRATIANVS P F AVG "Our Lord Gratianus Pious and Happy August" pearl-diademed, draped & cuirassed bust right
Reverse: VIRTVS ROMANORVM "Courage of the Romans" Roma seated facing on throne, looking left, holding Victory on globe and spear
This coin was minted at Trier (in Germany), mintmark TRPS.
DATE: 367 - 383 A.D. (this coin minted between 367 - 375 AD)
MINTMARK: TRPS (Trier, Germany)
WEIGHT: 1.73 grams
ATTRIBUTION: Trier, RIC 58a