Roman Empire. Theodosius I, with Arcadius and Honorius. Exagium Solidi Constantinople mint. Struck circa AD 402-408. EXAGIVM SOLIDI. Extremely rare

The exagium solidi was a type of official assay or test piece representing the standard gold solidus coin in the late Roman Empire. The specimen attributed to Theodosius I along with his sons Arcadius and Honorius, struck circa AD 402-408 at the Constantinople mint, is an extremely rare example. Theodosius I was the last emperor to rule both East and West before the empire’s permanent division. This coin embodies the monetary reforms that stabilized the empire’s gold currency during a time of administrative transformation. Such pieces are of great interest to collectors and historians due to their rarity and their role in the complex late antique economy.