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This is an ancient Roman silver Siliqua of emperor Arcadius dating to 395 - 402 A.D.
DN ARCADI-VS PF AVG pearl-diademed draped and cuirassed bust right
VIRTVS ROMANORVM 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: 392 - 395 A.D.
MINTMARK: MDPS (Milan, Italy)
SIZE: 14mm dia
WEIGHT: 0.83 grams
ATTRIBUTION: RIC IX 32b.3
PROVENANCE: originally found near Jarrow, Tyne-and-Wear