Muir o’Fauld is a watchtower along the Gask Ridge Roman frontier. When in use, it would have consisted of:
- a square timber tower
- a surrounding earthwork rampart
- a ditch and an upcast bank
What survives today is a 15.7m-wide circular mound, a ditch and an outer bank. A causeway leads 15m north of the mound to join the Roman road.
The Gask Ridge frontier is regarded as the earliest Roman example of a frontier system of roads, forts and watchtowers. It stretches over 37km from Glenbank to Bertha on the Tay.
The Romans’ initial invasion of Scotland came in AD 79–80, under Gnaeus Julius Agricola, Governor of Britain. It occurred during the reigns of Emperor Vespasian and his sons Titus and Domitian.
The Gask Ridge sites were all built in the early years of occupation, and were abandoned in about AD 87 or 88, as the Romans withdrew from Scotland.