Latitude/Longitude: 51.8839, -3.18616
Tretower Court and Castle has now re-opened to the public at the advertised opening hours.
Motte-and-bailey castle established during the Norman conquest of Brycheiniog. Shell-keep raised on the mound about 1150, and a round tower added in the early thirteenth century. OS map 161: SO 185212
Information from Cadw website
Tretower Castle is a Listed Building. Here's what the official description says about it:
An early motte and bailey castle underlie the fabric of the mainly mid twelfth to early thirteenth centuries castle at Tretower.Replaced as a residence by nearby Tretower Court (NPRN 16305) from about 1300, it was still largely intact in the early sixteenth century.
The surviving remains are of rubble sandstone and consist of a circular tower and the remains of a shell keep. The three storey tower with basement dominates - it has an entrance on the northern side at first floor level. The fireplace on the northwestern side on the first floor has moulded and scalloped corbels whilst a similar fireplace on the second floor has fine slab seats. The remains of the gatehouse are to the east of the keep and the kitchen and first-floor hall are to its south. The the solar is to its west.
(Source CADW listed buildings description)
RCAHMW, December 2008.
Information from British Listed Buildings