Castell Du

Castell Du, also known as Sennybridge Castle or Castell Rhyd-y-Briw, is located approximately eight miles west of Brecon in Powys, Wales, and is believed to be the work of Llywelyn ap Gruffudd, Prince of Wales. Its history is largely obscure, but a reference to a castle at Rhyd-y-Briw in a document of 1271 is believed to refer to the fortification, and it is not unreasonable to assume that work commenced on it during Llywelyn's triumphal years in the 1260s. Its life would seem to have been short, as there is no further reference to it in thirteenth-century documents, and it seems likely that it was captured by the forces of Edward I of England during the war of 1276–7 and subsequently abandoned. Much of the site remains to be excavated; the remains of a D-shaped tower are visible, and two other towers may lie under pill-boxes erected during the Second World War.

Sources

• Huw Pryce (ed.), The Acts of Welsh Rulers 1120–1283 (Cardiff, 2005).

See also

• Llywelyn ap Gruffudd
• Castles in Wales

Powys
Principal settlements	Brecon Builth Wells Crickhowell Hay-on-Wye Knighton Llandrindod Wells Llanfair Caereinion Llanfyllin Llanidloes Llanwrtyd Wells Machynlleth Montgomery Newtown Presteigne Rhayader Talgarth Welshpool Ystradgynlais
Communities	Abbey Cwmhir Aberedw Aberhafesp Banwy Bausley with Criggion Beguildy Berriew Bettws Brecon Bronllys Builth Cadfarch Caersws Carno Carreghofa Castle Caereinion Churchstoke Cilmery Clyro Cray Crickhowell Disserth and Trecoed Duhonw Dwyriw Erwood Felin-fach Forden with Leighton and Trelystan Gladestry Glantwymyn Glasbury Glascwm Glyn Tarell Guilsfield Gwernyfed Hay Honddu Isaf Kerry Knighton Llanafan Fawr Llanbadarn Fawr Llanbadarn Fynydd Llanbister Llanbrynmair Llanddew Llanddewi Ystradenny Llandinam Llandrindod Wells Llandrinio Llandysilio Llandyssil Llanelwedd Llanerfyl Llanfair Caereinion Llanfechain Llanfihangel Llanfihangel Cwmdu with Bwlch and Cathedine Llanfihangel Rhydithon Llanfrynach Llanfyllin Llangamarch Llangattock Llangedwyn Llangors Llangunllo Llangurig Llangynidr Llangyniew Llangynog Llanidloes Llanidloes Without Llanigon Llanrhaeadr-ym-Mochnant Llansantffraid Llansilin Llanwddyn Llanwrthwl Llanwrtyd Wells Llanyre Llywel Machynlleth Maescar Manafon Meifod Merthyr Cynog Mochdre Montgomery Nantmel New Radnor Newtown and Llanllwchaiarn Old Radnor Painscastle Pen-y-bont-fawr Penybont Presteigne Rhayader St Harmon Talgarth Talybont on Usk Tawe Uchaf The Vale of Grwyney Trallong Trefeglwys Treflys Tregynon Trewern Welshpool Whitton Yscir Ystradfellte Ystradgynlais
Towns and villages	Abbeycwmhir Aber Clydach Aberbechan Aberbran Abercegir Abercraf Abercynllaith Aberedw Abergwesyn Abergwydol Aberhafesp Aberhosan Abermule Abernant Abertridwr Aberyscir Adfa Aithnen Arddlin Bacheldre Beguildy Berriew Bettws Cedewain Beulah Bont Dolgadfan Boughrood Bronllys Builth Wells Burgedin Buttington Bwlch Caehopkin Caersws Capel-y-ffin Carno Cathedine Cemmaes Road Church Stoke Cilmery Clatter Clyro Coelbren Commins Coch Crickhowell Criggion Crossgates Cwmdauddwr Cwmdu Cwmtwrch Cwmwysg Cwrt y Gollen Derwenlas Dolanog Dolfach Dolyhir Dylife Erwood Esgairgeiliog Forge Four Crosses Gladestry Glasbury Hay-on-Wye Heartsease Heol Senni Kerry Knucklas Libanus Llan Llanafan Fawr Llanbrynmair Llanddew Llandinam Llandrinio Llandysilio Llanelwedd Llanfair Caereinion Llanfechain Llanfihangel Nant Bran Llanfyllin Llangadfan Llangammarch Wells Llangedwyn Llangors Llangurig Llangynidr Llangynog Llangynyw Llanllwchaiarn Llanrhaeadr-ym-Mochnant Llansantffraed Llansanffraid-ym-Mechain Llansilin Llanwchaiarn Llanwrin Llanwrthwl Llanwrtyd Wells Llanwrtyd Llanymynech Llanyre Llawryglyn Llyswen Llywel Meifod Milebrook Morben Nant Glas New Radnor Newbridge-on-Wye Old Church Stoke Painscastle Pandy Pant-y-Dwr Partrishow Penegoes Pennant Penwyllt Penybont Pilleth Plas Esgair Pont Crugnant Pontdolgoch Pontrobert Sarn Sennybridge St Harmon Staylittle Sycharth Talerddig Talgarth Talybont-on-Usk Three Cocks Tirabad Trecastle Trefeglwys Tregynon Trewern Tylwch Van, Llanidloes Ystradfellte
Castles	Aberysgir Castle Aberedw Castle Castell Dinas Castell Du Cefnllys Colwyn Castle Dolforwyn Castle Llangoed Hall Mediomanum Montgomery Castle Painscastle Powis Castle Tretower Castle
Reservoirs and lakes	Beacons Reservoir Cantref Reservoir Clywedog reservoir Elan Valley Reservoirs Llangorse Lake Lake Vyrnwy Talybont Reservoir
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Coordinates: 51°56′36″N 3°34′23″W / 51.9432°N 3.5731°W / 51.9432; -3.5731