"The tetarteron (Greek: τεταρτηρόν, "quarter ") was a Byzantine term applied to two different coins, one gold circulating from the 960s to 1092 in parallel to the histamenon, and one copper used from 1092 to the second half of the 13th century.
" - (Wikipedia (en) 23.04.2019)
"The tetarteron (Greek: [νόμισμα] τεταρτηρόν, "quarter [coin]") was a Byzantine term applied to two different coins, one gold circulating from the 960s to 1092 in parallel to the histamenon, and one copper used from 1092 to the second half of the 13th century." - (Wikipedia (en) 26.08.2023)
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