A pes (plural: pedes) is an ancient Roman unit of length that roughly corresponds to a modern foot, which it is the etymological ancestor of, as "pes" literally means "foot" in Latin. In terms of modern reference, the Roman foot measured 0.971 feet (29.6 cm). There are twelve unciae in one pes. There are 2.5 pedes in one gradus.
- Heinrich Glarean The Intellectual World of a Sixteenth-Century Musical Humanist. Chapter 8, Cambridge University Press, 2013.
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