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House of Mathrafal

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Title: House of Mathrafal  
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Subject: Owain Glyndŵr, Royal house, Dynasty, Bleddyn ap Cynfyn
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House of Mathrafal

House of Mathrafal

Arms of the Mathrafal House of Powys
Country Wales
Ancestral house House of Dinefwr
Titles King of Gwynedd and Powys, Prince of Powys, Prince of Powys Wenwynwyn, Prince of Powys Fadog, Lord of Glyn Dyfrdwy, Lord of Powys, Baron Grey of Powis
Founder Bleddyn ap Cynfyn, King of Gwynedd and Powys
Founding 1063
Cadet branches

The House of Mathrafal began as a cadet branch of the House of Dinefwr, taking their name from Mathrafal Castle, their principal seat and effective capital. Although their fortunes rose and fell over the generations, they are primarily remembered as kings of Powys in central Wales.

They with the Houses of Aberffraw, Dinefwr, and Seisyll their descent from Merfyn the Oppressor who, along with his son Rhodri, established their control over northern and western Wales. Rhodri replaced King Cyngen in Powys after the latter died while on pilgrimage to Rome, allegedly because of his mother or wife (sources differ) Nest but more likely[1] through conquest. Cyngen's true heirs were either exiled or reduced to the level of minor land owners (e.g., the family of Sir Gruffudd Vychan).

In the traditional accounts, Rhodri divided his kingdom among his sons and gave Powys to his youngest, Merfyn. King Cadell in Ceredigion then dispossessed his brother and added Powys to his inheritance. It's possible, however, that Powys remained independent until its 916 annexation by Cadell's son Hywel Dda, who also conquered Dyfed and Gwynedd and established what has become known as the realm of Deheubarth. On the death of Hywel's grandson Maredudd ab Owain in 999, the realm splintered: Irishmen usurped Gwynedd and falsely passed themselves off as Maredudd's heir in Dyfed. These were removed by Llywelyn ap Seisyll, from a cadet branch of the Aberffraw line in the commote of Rhuddlan.

The house of Mathrafal was effectively established in the wake of Harold and Tostig Godwinson's disastrous raids in 1062 and 1063. They installed Bleddyn ap Cynfyn over Powys and Gwynedd and he kept his base in Mathrafal close to the Saxon border. From this point forward, his family jockeyed with the Dinefwr and Aberffraw dynasties for control of Wales. (The unrelated dynasty in Gwent and Morgannwg was swiftly overrun by the Marcher Lords after the Norman Conquest.) The House of Mathrafal's influence was greatest between 1063 to 1081, when they lost control of Gwynedd to a resurgent Aberffraw family following the Battle of Mynydd Carn. By 1191, Powys was divided between Powys Fadog in the north and Powys Wenwynwyn (roughly modern Montgomeryshire) in the south. The first became a more-or-less loyal vassal of Gwynedd; the latter, one of its main competitors.

Historian John Davies points out that, following the division of Powys, the dynasty should not be considered as "equal" to that of Aberffraw or Dinefwr. Mathrafal Castle was utterly destroyed by Gwynedd in 1212 and thenceforth it was entirely dependent on English support for its survival. However, the Mathrafal dynasty continued to exert some influence, undermining and eventually betraying Llywelyn the Last on behalf of Edward I during his conquest of Wales in 128283. Thereafter, they avoided his campaign of extermination against the Welsh royal houses and even exchanged their claims to royalty for an English lordship at the Parliament of Shrewsbury in 1283. They were finally displaced by the lords of Mortimer in the early 14th century.


Main article: list of kings of Powys

Members of the Mathrafal Dynasty include Bleddyn ap Cynfyn, Maredudd ap Bleddyn, Gwladys ferch Rhiwallon, Trahaearn ap Caradog, Gwenwynwyn ab Owain Cyfeiliog, and Griffith and Owen de la Pole.


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