Castell Du is a native Welsh castle built around 1260. The castle consists of ruinous walls and the fragmentary remains of a mural tower. A perimeter wall encloses an area about 26 metres on one side. In the wall is a projecting tower in the D-shape favoured by Welsh military architects.
The tower is 8.5 metres wide, with walls 1.8 metres thick. During World War II a pair of pillboxes were constructed and carefully camouflaged within the castle ruins.
We do not know for certain who was responsible for building Castell Du, but one possibility is Llewelyn ab Gruffudd. An intriguing historical record from 1265 mentions that Edward I destroyed 'a castle beyond Brecon', which may be Castle Du.
Note that there are several other fortifications in wales known as Castle Du, for example, there is one near Dolgran in Carmarthenshire.
About Castell Du (Sennybridge Castle)
Address: Castle Road, Sennybridge, Powys, Wales
Attraction Type: Castle
Location: At Sennybridge, off the A40, on private land
Location map
OS: SN919283
HERITAGE
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NEARBY HISTORIC ATTRACTIONS
Heritage Rated from 1- 5 (low to exceptional) on historic interest
Defynnog, St Cynog Church - 0.5 miles (Historic Church) 
Camlais Castle - 2.7 miles (Castle)
Llywel, St David's Church - 3.3 miles (Historic Church)
Brecon Gaer Roman Fort - 5.3 miles (Roman Site)
Llanspyddid, St Cattwg Church - 5.5 miles (Historic Church)
Trecastle Mountain (Y Pigwyn) Stone Circles - 5.6 miles (Prehistoric Site)
Maen Llia Standing Stone - 5.7 miles (Prehistoric Site)
Pigwn Roman Marching Camps - 5.9 miles (Roman Site)
Nearest Holiday Cottages to Castell Du (Sennybridge Castle):
Builth Wells, Powys
Sleeps: 10
Stay from:£1,027 - £5,215
