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This is an ancient Roman gold solidus of emperor Arcadius dating to 383 - 408 A.D.
D N ARCADI-VS P F AVG three-quarter facing bust, holding spear over shoulder and shield decorated with horseman.
CONCORDI-A AVGGS Constantinopolis enthroned with sceptre and Victory on globe.
This coin was minted at Constantinople (in Turkey), mintmark CONOB with S (for secunda), SECVNDA, B (beta), OFF S (officina secunda).
DATE: 383 - 408 AD this coin was minted between 397 - 402 AD
MINTMARK: CONOB (Constantinople, Turkey)
SIZE: 20mm diameter
WEIGHT: 4.35 grams
ATTRIBUTION: Sear 20706. Constantinople RIC X 7, S / Kamp.: 165.1, RIC: 7, Depeyrot: 55.