Tomen yr Allt

| caption = View from Bodfach Hall towards Tomen yr Allt (peak one third of the way across the skyline from the left) }} Tomen yr Allt was the caput of the commote of Mechain Uwch Coed in the cantref of Mechain. In 1160, when the Kingdom of Powys was divided, Mechain became part of the principality which later came to be known as Powys Wenwynwyn. By 1208, the region was controlled by Llywelyn the Great. After his death in 1241, his heir had to come to terms with Henry III of England, which resulted in Powys Wenwynwyn passing to the rule of Gruffydd ap Gwenwynwyn who was allied to Henry III. Llywelyn ap Gruffudd, the grandson of Llywelyn the Great and the Prince of Gwynedd, began to expand…

The site is over in diameter; the central man-made earthwork mound (motte) is about and nearly high. There is a continuous stony ditch, which is doubled on the north-east side, away from the natural slope of the hill. The bank is flattened where it joins fields on the south-east side and no bailey is apparent in that section. Most of the earthworks remain and the keep of the castle was probably timber, as CPAT (Clwyd-Powys Archaeological Trust) found a piece of daub and the remains of a burnt layer in 1978. The site is a Cadw scheduled monument.