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The following systems arose from earlier systems, and in many cases utilize parts of much older systems. For the most part they were used to varying degrees in the Middle Ages and surrounding time periods. Some of these systems found their way into later systems, such as the Imperial system and even SI. == English System == Before Roman units were reintroduced in 1066 by Norman William the Conqueror, there was an Anglo-Saxon (Germanic) system of measure based on the units of the ''barleycorn'' and the ''gyrd'' (rod). The systems partly merged. Later development of the English system continued by defining the units by law in the Magna Carta of 1215, and issuing measurement standards from the then capital Winchester. Standards were renewed in 1496, 1588 and 1758. The last ''Imperial Standard Yard'' in bronze was made in 1845; it served as the standard in the United Kingdom until the yard was internationally redefined as 0.9144 metre in 1959 (statutory implementation: Weights and Measures Act of 1963). Much of the units would go on to be used in later Imperial units and in the US system, which are based on the English system from the 1700s. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Medieval weights and measures」の詳細全文を読む スポンサード リンク
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