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This is a nice excavated ancient Roman silver Siliqua, of emperor Julian II, dating to 360 - 363 A.D.
DN CL IVLI-ANVS AVG, pearl-diademed, draped and cuirassed bust right
VOTIS V MVLTIS X in four lines within wreath.
This coin was minted at Trier in Germany mint mark TR. It had traveled across the English Channel, being discovered by a metal detectorist in Wiltshire.
DATE: 360 - 363 A.D.
MINTMARK: TR (Trier, Germany)
SIZE: 18.02mm dia
WEIGHT: 2.11 grams
Attribution: RIC VIII Trier 363; RSC 157a; Sear 19129.