The Tremissis denomination
The tremissis or tremis was a small solid 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).
Tremissis

(1) Heraclius 610 - 641 AD
Obverse: dN hЄRACLIЧS PP AVG Heraclius pearl diademed, draped, cuirassed bust right
Reverse: VICTORIA AVÇЧ І Cross potent/ CONOB
Ref: Sear Byzantine 786