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This is an ancient Roman gold Solidus of emperor Theodosius II, who reigned from 408 - 450 A.D.
D N THEODOSIVS P F AVG,
D[ominvs] N[oster] THEODOSIUS P[ivs] F[elix] AVG[vstvs] "Our Lord Theodosius, Dutiful and Wise Augustus" helmeted, cuirassed three-quarters-facing bust, spear over shoulder and shield decorated with horseman spearing enemy.
CONCORDI-A AVGGG, Constantinopolis seated facing with sceptre and Victory on globe
This coin was struck at the Constantinople mint, between the years 408 - 420 A.D. It bears the Officina letter Δ(Delta) on the end of the reverse legend after AVGGG Δ, this indicates the coin to have been minted by the 4th Officina at the Constantinople mint. mintmark CONOB. This coin has seen plenty of circulation but is a nice example in VF condition.
DATE: 408 - 420 A.D.
MINTMARK: COMOB (Constantinople, Turkey)
SIZE: 20.35mm diameter
WEIGHT: 3.99 grams
ATTRIBUTION: RIC X 202m Sear 21127