Tomen, Llansantffraid is a probable castle mound. This could be the castle built by Rhys ab Gruffudd in 1177, destroyed in 1190, rebuilt and again destroyed in 1194, however, these events are usually linked to the castle site across the river (NPRN 94001).
An irregular steep sided flat topped mound in the region of 12-15m across and 3.7m high, it is crowded on all sides by modern buildings and has been disturbed by gardening. Known as 'Tower Hill' in the eighteenth century, it was described as 'deeply ditched or moated round' in 1818. There are reports of a 'low unmortared wall'. There is no trace of a suggested bailey.

Source: RCAHM Radnorshire Inventory (1913), 102-3 No. 409

John Wiles 31.07.07