"The triens (plural trientes) was an Ancient Roman bronze coin produced during the Roman Republic valued at one-third of an as (4 unciae). The most common ...
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design for the triens featured the bust of Minerva and four pellets (indicating four unciae) on the obverse and the prow of a galley on the reverse. It was not a common denomination and was last struck c. 89 BC.
Later, in Frankish Gaul, the term "triens" was often used for the tremissis, since both terms meant "a third"." - (en.wikipedia.org 08.03.2020)
