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This is an ancient Roman gold solidus of emperor Arcadius dating to 383 - 408 AD.
Obverse: DN ARCADI-VS PF AVG "Our Lord Arcadius Pious Fortunate August" pearl-diademed draped and cuirassed bust right
Reverse: VICTORI-A AVGGG, "Victory of the Augusts" emperor standing right, spurning captive with foot, holding labarum and Victory on globe,
M-D either side for Milan and COMOB in ex. *
*The moneta comitatensis was a travelling mint attached to the imperial train wherever the Emperor was situated. A special mintmark COM for comitatus (or COMT.M) Most coins signed by the comitatensian mint also bear a supplementary abbreviation referring to the name of the town where the coin was actually struck in this case in Milan.
DATE: 383 - 408 AD
MINTMARK: MD (Milan, Italy)
SIZE: 20.34mm diameter
WEIGHT: 4.38 grams
ATTRIBUTION: (RIC 1253 (r4); Depeyrot 34/1) RIC X 1251; Sear 20726.
PROVENANCE: Formerly in a private collection, Newport. United Kingdom.