Maen Richard stands 420m above O.D. on the parish boundary between Llanfihangel Nant Bran and Merthyr Cynog. It occupies a circular hollow and appears to be of a volcanic agglomerate 1.52m high, and 0.81m by 0.45m at the base. There is a bench mark incised on its N. face.
(From An Inventory of the Ancient Monuments of Brecknock (Brycheiniog) - Part i: Later Prehistoric Monuments and Unenclosed Settlements to 1000 A.D. Royal Commission on the Ancient and Historical Monuments of Wales (1997))