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William of Malmesbury's Deeds of the Kings of England records that during the reign of Henry I (1100 - 1135), "the measure of his arm was applied to correct the false ell of the traders and enjoined on all throughout England."[4] The folktale that the length was bounded by the king's nose[5] was added some centuries later. Charles Moore Watson dismisses William's account as "childish",[6] but William was among the most conscientious and trustworthy medieval historians.[7] The French "king's foot" was supposed to have derived from Charlemagne,[7] and the English kings subsequently repeatedly intervened to impose shorter units with the aim of increasing tax revenue.[citation needed]