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This is an ancient Roman silver Siliqua of emperor Valens, dating to 367 - 375 A.D.
D N VALEN S P F AVG pearl-diademed draped and cuirassed bust facing right
VRBS ROMA, Roma seated left on throne holding Victory on globe and spear
This coin was minted at Treveri (Trier, Germany), mintmark TRPS. It had traveled across the English Channel, being buried in the Thruxton Hoard. This coin was purchased directly from the finder after being disclaimed by the British Museum.
DATE: 367 - 375 A.D.
MINTMARK: TRPS (Trier )
SIZE: 18mm dia
WEIGHT: 1.9 grams
ATTRIBUTION: RIC IX 46a.2; RSC 110b