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Solidus

AD 312–　・　gold　・　4th century　・　Constantinople

Solidus（obverse）
Unknown / CC0（Wikimedia Commons）

The 4.5g gold coin laid down by the emperor Constantine. The Byzantine empire held its purity almost intact for some 700 years, and it became the key currency of the Mediterranean world — the dollar of the Middle Ages. Holding the purity was the credit of the state.

Diameter 21mm