Maesyfelin, St Lythans, Vale of Glamorgan (GLA 10)
ST 1010 7230. 1km SW of St Lythans, a small village that can be found along a signposted minor road leading SWfrom the A4050 just south of the junction between the A48(T) and the A4232 on the western outskirts of Cardiff. Maesyfelin is immediately S of the road between St Lythans and Dyffryn. Roadside parking. Cadw.

A striking stone chamber built from three massive uprights forming a box-like structure, open to the east, supporting an enormous capstone (4.5m by 3m by 0.8m thick) estimated to weigh in excess of 30 tonnes. The underside of the capstone stands about 1.8m above the present floor of the chamber. Known also as Gwalyfiliast, the name translates as the 'kennel of the greyhound bitch', and indeed the chamber does look rather like a giant dog-kennel.
The chamber lies at the east end of the long mound some 25m by 10m, much of it heavily robbed. J.W. Lukis records finding pottery and human remains in earth thrown out of the chamber sometime before 1875, but there has never been a scientific investigation of the site. Its main interest is the size and construction of the chamber. Further reading: Savory 1971; RCAHMW 1976, 39.
Text © Timothy Darvill.

In late 2011 the Tinkinswood Community Archaeology Group excataved a large area of much ploughed out barrow of St. Lythans. They created an illustrated blog of the dig, which can be accessed here - http://tinkinswoodarchaeology.wordpress.com/

Side view photogrammetry of St.Lythans showing much denuded mound. Image © Adam Stanford. Dramatic shot of the chamber of St.Lythans. Image © Adam Stanford. The Tinkinswood community archaeology diggers standing by their hard work. Image © Adam Stanford/Aerial-Cam.