A substantial building platform, part of a deserted settlement (NPRN 421258), is located on the west facing slopes of Gelligaer Common. It lies 9m below a smaller platform (15305, the 'upper house'). The platform terrace, embanked along the north and south long sides, now measures 18.4m long (east by west) by 6.6m wide, is cut back to 1m deep and built out to 1.2m high. The platform and building upon it were excavated in 1936 and interpreted as a dwelling.
A.Fox, Archaeologia Cambrensis 92 (1937), 247-68.
RCAHMW, Glamorgan Inventory, vol.3 (pt.2), 27-8.

RCAHMW, 23 October 2015