The en-y-Wyrlodd Long Barrow is a mutilated long cairn, approximately 15.5m by 10m and 0.7m high. Excavations in 1921-2 revealed two chambers, and the finds included Roman material.

Source: Briggs, C.S., 1997, An Inventory of the Ancient Monuments in Brecknock (Brycheiniog), The Prehistoric and Roman Monuments, Part i: Later Prehistoric Monuments and Unenclosed Settlements to 1000 A.D. RCAHMW. pp 60-62.

T. Driver, RCAHMW, 19 June 2007.