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This is an ancient Roman silver Siliqua of emperor Arcadius dating to 383 - 408 AD.
obverse: DN ARCADI-VS PF AVG "Our Lord Arcadius Pious Fortunate August" pearl-diademed draped and cuirassed bust right.
Reverse: VIRTVS ROMANORVM "Courage of the Romans" Roma seated left on cuirass, holding Victory on globe and inverted spear.
This coin was minted at Milan (Milan, Italy), mintmark MDPS. This coin would have been included within the last official shipment of silver to Britain before Rome abandoned all interest in the province in 410 A.D. As such many of these coins display clipping well into the Saxon period.
DATE: 383 - 408 AD (This coin minted between 393 - 394 AD)
MINTMARK: MDPS (Milan, Italy)
SIZE: 16mm dia
WEIGHT: 1.14 grams
ATTRIBUTION: RIC IX 32b; RSC 27b.
PROVENANCE: Formerly in a private collection, London.