Cefnllys Castle, near Llandrindod Wells, Powys , Wales Cefnllys was a mediaeval town in Radnorshire (now part of Powys) in central Wales. Close by , on the hill known as Castle Rock , are the the remains of what is known as Cefnllys Castle. The 'castle' was actually two, built one after the other at opposite ends of the hill by the English lord Roger Mortimer of Wigmore during his battles with Llywelyn ap Gruffudd, Prince of Wales, for the cantref of Maelienydd. The first, at the north end, was built in 1242 and ruined in 1262 by Llywelyn. The second, at the south end, was built in 1268 and survived Llywelyn's death, but was ruined by 1588. 固opFoto / Fortean