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This is an ancient Roman gold Solidus of emperor Honorius dating to 393 - 423 A.D.
DN HONORI-VS PF AVG, helmeted, cuirassed 3/4 facing bust with spear over shoulder and shield with horseman motif D[ominvs] N[oster] HONORIVS P[ivs] F[elix] AVG[vstvs] "Our Lord Honorius, Dutiful and Wise Augustus"
CONCORDI AAVGG, "Harmony of the two Emperors" Constantinopolis seated facing, holding Victory on globe and sceptre
Officina letter Θ (theta numeral 9, ninth Officina) after AVGG
This is a lovely coin, nice detail and displaying some circulation. The fields bear graffiti in the form of runic lettering, so this coin was likely paid out as a tribute to the Goths or Germanic hordes.
DATE: 397-402 A.D.
MINT: Constantinople / struck by the 9th officina.
SIZE: 20.58mm dia
WEIGHT: 4.32 grams
ATTRIBUTION: RIC 8; Depeyrot 55/2 Sear 20899.