How to Identify the Solidus of Arcadius

Start with the obverse legend, because the portrait alone will not settle the attribution. A right-facing, pearl-diademed bust in gold is shared by the whole Theodosian dynasty, so read the Latin around the edge. Arcadius is named with forms such as D N ARCADIVS P F AVG. Legends naming THEODOSIVS or HONORIVS point to his father, brother, or nephew rather than to Arcadius himself, even though their youthful portraits look almost identical.

Assess size, weight, and metal next. A solidus is a small, thin, broad coin, roughly 20-22 mm across and close to 4.5 grams, struck in high-purity gold that stays bright yellow without tarnish. The flan is noticeably flatter and wider than the compact aureus of earlier centuries. Genuine gold of this period has crisp, hand-struck relief and a dense feel for its size; a coin markedly under or over this weight deserves scrutiny.

Work the reverse and its mint mark for a full attribution. This example shows a triumphal reverse with a Victory holding a shield and palm beside a standing military figure, a theme common on Theodosian gold. The reverse type together with the mint mark in the exergue is what ties a coin to a specific issue, mint, and date. Look for legends such as VICTORIA AVGGG, CONCORDIA AVGG, or NOVA SPES REIPVBLICAE, and for the exergual mark, commonly CONOB on issues from Constantinople. Matching type and mark against a reference such as Roman Imperial Coinage confirms the exact issue.

Be cautious about authenticity, because ancient gold is heavily forged. Warning signs include incorrect weight or diameter, a soft or grainy surface suggesting a cast rather than a struck coin, a visible seam around the edge, lettering or portrait style that does not match published dies, and gold that looks too red or too brassy. Modern replicas exist in both gold and gilt base metal. Given the sums involved, treat any solidus of Arcadius as needing expert authentication and documented provenance before purchase.