In the Roman Empire, one of these equaled 1,000 paces &, on roads, was marked with a special stone
The later 
milion, milion, was a Roman mile of 1000 paces, 1680 modern yards, ... in terms 
of the length of a square of equal area, so when reading one must ... to carriage 
axles, as described in Vitruvius, and marked on mile stones.