Roman examples show stones, normally cylindrical, up to two metres high. These were placed along all principal roads, and instances are found from about 250 BC onwards. The stone was typically inscribed to give the distance in (Roman) miles to the nearest major town, and commonly a date of installation, expressed in terms of Republican magistracies, or the years of an Emperor’s reign.
The Macmillan dictionary of archaeology, Ruth D. Whitehouse, 1983Copied