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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: VIRTVS RO-MANORVM "Courage of the Romans" Roma seated left on cuirass, holding Victory and reversed spear.
This coin was struck at the Trier mint (in Germany), 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 388 - 392 AD)
MINTMARK: TRPS (Trier, Germany)
SIZE: 18mm diameter
WEIGHT: 2.01 grams
ATTRIBUTION: RIC IX 94b; RSC 57†a.
PROVENANCE: Formerly in a private collection, Aberdeen.