> The distance was indirectly standardised by Agrippa's establishment of a standard Roman foot (Agrippa's own) in 29 BC,[9] and the definition of a pace as 5 feet. An Imperial Roman mile thus denoted 5,000 Roman feet. Surveyors and specialised equipment such as the decempeda and dioptra then spread its use.[10]
In modern times, Agrippa's Imperial Roman mile was empirically estimated to have been about 1,617 yards (1,479 m) in length.[11]