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This is an ancient Roman gold solidus of emperor Arcadius dating to 394 - 408 A.D.
DN ARCADI-VS PF AVG pearl-diademed draped and cuirassed bust right
VICTORI AAVGGG emperor standing right, foot on captive, holding standard and Victory who crowns him
This coin was minted at Milan (in Italy), mintmark MD either side.
DATE: 394 - 408 A.D.
MINTMARK: MD (Milan, Italy)
SIZE: 20mm diameter
WEIGHT: 4.34 grams
ATTRIBUTION: RIC IX Milan 35b; Sear 20724.