Tremissis

thumb|Tremissis from Constantinople in the second reign of Zeno (emperor)|Zeno upright|thumb|Merovingian dynasty|Frankish gold Tremissis with Christian cross, issued by minter , [[Dorestad, Netherlands, mid-600s]]

The tremissis or tremis (Greek: τριμίσιον, trimision) was a small pure gold coin of Late Antiquity. Its name, meaning "a third of a unit", formed by analogy with semissis (half of a unit), indicated its value relative to the solidus. It was introduced into Roman currency in the 380s by the Emperor Theodosius I and initially weighed 8 siliquae (equivalent to 1.52 grams).