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In page Mile:

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The Roman mile (mille passus, lit. "thousand paces"; abbr. m.p.; also milia passuum[n 1] and mille) consisted of a thousand paces as measured by every other step—as in the total distance of the left foot hitting the ground 1,000 times.[2] The distance was indirectly standardised by Agrippa's establishment of a standard Roman foot (Agrippa's own) in 29 BC,[3] and the definition of a pace as 5 (Roman) feet.[citation needed] An Imperial Roman mile thus denoted 5,000 Roman feet. Surveyors and specialised equipment such as the decempeda and dioptra then spread its use.[4]