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histamenon : ウィキペディア英語版
histamenon

''Histamenon'' (, "standard coin") was the name given to the gold Byzantine ''solidus'' when the slightly lighter ''tetarteron'' was introduced in the 960s. To distinguish the two, the ''histamenon'' was changed in form from the original ''solidus'', becoming wider and thinner, as well as concave (scyphate) in form. Later usually shortened to ''stamenon'' (Greek: στάμενον), it was discontinued after 1092. In the 12th and 13th centuries, the name ''stamenon'' came to be applied to the concave billon and copper ''trachea'' coins.
==Establishment==
Ever since Emperor Constantine I (r. 306–337) introduced it in 309, the Byzantine Empire's main coinage had been the high-quality ''solidus'' or ''nomisma'', which had remained standard in weight (4.55 grams) and gold content (24 carats) through the centuries.〔; .〕 The Byzantine emperor Nikephoros II Phokas (r. 963–969), however, introduced a new coin, the ''() tetarteron'' ("quarter ()") which was 2 carats (i.e. about 112, despite its name) lighter than the original ''nomisma''. The latter now became known as the ''histamenon'', from the Greek verb , "to stand up", implying that these followed the traditional standard.〔.〕〔; .〕 The reasons for this change are not clear; Byzantine chroniclers, however, suggest fiscal motives, reporting that Nikephoros collected the taxes as before in the ''histamenon'' while paying back with the ''tetarteron'', which was officially rated as equal in value to the full-weight coin.〔
Initially, the two coins were virtually indistinguishable except in weight. During the later reign of Basil II (r. 976–1025), the ''tetarteron'' began to be minted in a thicker and smaller form, while the ''histamenon'' became correspondingly thinner and wider. Only during the sole rule of Constantine VIII (r. 1025–1028), however, did the two coins become iconographically distinct as well.〔.〕〔.〕 By the mid-11th century, the ''tetarteron'' measured 18 mm wide and its weight apparently standardized at 3.98 grams, i.e. three carats less than the ''histamenon'' or ''stamenon'' (a name first attested in 1030), which now measured 25 mm in diameter (as opposed to 20 mm for the original ''solidus''). In addition, under Michael IV the Paphlagonian (r. 1034–1041), it began to be minted in a slightly concave (scyphate) form, possibly to increase the thin coin's strength and to make it less easily bent. Flat coins were still struck at times, but scyphate ones came to predominate from Constantine IX (r. 1042–1055) on and became standard under Isaac I Komnenos (r. 1057–1059). These concave coins were known as ''histamena trachea'' or simply ''trachea'' (τραχέα, "rough, uneven") from their shape.〔; ; .〕〔.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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