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This is an ancient Roman silver siliqua of emperor Theodosius I dating to 388 - 392 AD.
Obverse: DN THEODO-SIVS P F AVG "Our Lord Theodosius, pious, fortunate, August (Emperor)" Pearl-diademed, draped and cuirassed bust right.
Reverse: VRBS ROMA "City of Rome" Roma seated left on cuirass, holding Victory and spear.
This coin was struck at the Rome mint (in Italy), having travelled across the Channel and being lost in Britain. This would have been included with some of the last Roman coinage to enter Britain before the Romans abandoned the province in 410 A.D.
DATE: 379 - 395 AD (this coin was issued between 378-383 AD)
MINTMARK: R*B (Rome, Italy)
SIZE: 18.8mm diameter
WEIGHT: 1.59 grams
ATTRIBUTION: RIC IX 35c(1); RSC 71a
PROVENANCE: Formerly in a private collection, Worcestershire.