Llangynwyd Castle, a section of the Gallery in South Wall. This is a medieval ringwork castle with 12th and 13th century phases. A Norman structure reconstructed by Gilbert de Clare in the 1260s. Originally with a great gatehouse with twin drum towers, and was partly excavated in 1906. The Royal Commission have identified close parallels to the defensive arrangements of Llangynwyd to those at Caerphilly Castle, built by Gilbert de Clare from 1268. The castle was burned in the riots of 1294-5 and does not appear to have been restored.