Miliarense
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A miliarense (neuter form of the late Latin miliarensis "pertaining to a thousand") was the only fairly regularly minted silver coin issued by the Roman and Byzantine Empire. It was struck with variable fineness, generally with a weight between 6.5 and 8.5 grams. The miliarense was struck from the beginning of the 3rd century under Constantine II with a diameter of 22 mm [1], but it became more common from the 7th to the 9th century.
There were two kinds of miliarense: light and heavy. It took 14 heavy miliarensia and 18 light miliarensia to equal one solidus.