[1][2] "Tomen ar hallt" is modern Welsh for "mound on the wooded hillside."

There is a continuous stony ditch, which is doubled on the north-east side, away from the natural slope of the hill.

[3][4] The bank is flattened where it joins fields on the south-east side and no bailey is apparent in that section.

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.

[7] Presumably Tomen yr Allt is the "castle of Bodyddon" to which the reports refer, which was destroyed in 1257.