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This is an ancient Roman silver Siliqua of emperor Valentinian, dating to 364 - 367 A.D.
DN VALENTINI-ANVS P F AVG pearl-diademed draped and cuirassed bust facing right
VRBS ROMA, Roma seated left on throne holding Victory on globe and reversed spear
This coin was minted at Rome (mintmark RP). It had traveled across the Roman Empire, being buried in the Thruxton Hoard in Hampshire. This coin was purchased directly from the finder after being disclaimed by the British Museum.
DATE: 364 - 367 A.D.
MINTMARK: RP (Rome)
SIZE: 18mm dia
WEIGHT: 1.8 grams
ATTRIBUTION: RIC IX 11a, P
PROVENANCE: Found in the Thruxton Hoard, Hampshire, England.