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This is a nice ancient Roman silver Siliqua of emperor Gratian dating from 375 - 378 AD.
Obverse: DN GRATIANVS P F AVG "Our Lord Gratianus Pious and Happy August" pearl-diademed, draped & cuirassed bust right
Reverse: VRBS ROMA "City of Rome" Roma seated left on cuirass, holding Victory on globe and reversed spear.
This coin was minted between the years 375 - 378 at Treveri (Trier in Germany), mintmark TRPS. It had travelled to Britain, being discovered by a metal detectorist in Wiltshire.
DATE: 367 - 383 AD. (this coin minted between 375 - 378 AD)
MINTMARK: TRPS (Trier, Germany)
SIZE: 16.9mm diameter
WEIGHT: 1.53 grams
ATTRIBUTION: RIC IX 46b1; DOCLR –; RSC 87†a.
PROVENANCE: Formerly in a private collection, Wiltshire.