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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 found in Norfolk.
DATE: 367 - 375 A.D.
MINTMARK: TRPS (Trier )
SIZE: 16mm dia
WEIGHT: 1.91 grams
ATTRIBUTION: RIC IX 46a.2; RSC 110b