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Ystlyg ( en, possibly curve or open country) was a medieval cantref in the
Kingdom of Powys The Kingdom of Powys ( cy, Teyrnas Powys; la, Regnum Poysiae) was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. It very roughly covered the northern ...
. It lay at the east of the kingdom on the border with England. It consisted of the
commote A commote (Welsh ''cwmwd'', sometimes spelt in older documents as ''cymwd'', plural ''cymydau'', less frequently ''cymydoedd'')'' Geiriadur Prifysgol Cymru'' (University of Wales Dictionary), p. 643 was a secular division of land in Medieval W ...
s (''cymydau'') of Deuddwr in the north, Ystrad Marchell in the centre, Llannerch Hudol (also written Llannerchwdwl, Llanerchydol or Llannerchudol) in the south, and Y Gorddwr (or Corddwr) in the east beyond the
River Severn , name_etymology = , image = SevernFromCastleCB.JPG , image_size = 288 , image_caption = The river seen from Shrewsbury Castle , map = RiverSevernMap.jpg , map_size = 288 , map_ ...
and
Offa's Dyke Offa's Dyke ( cy, Clawdd Offa) is a large linear earthwork that roughly follows the border between England and Wales. The structure is named after Offa, the Anglo-Saxon king of Mercia from AD 757 until 796, who is traditionally believed to ...
. Ystad Marchell, Llannerch Hudol and Deuddwr formed the ''Teirswydd'' (English: three ommotes(literally, swydd is ''post'' as in an
office An office is a space where an organization's employees perform administrative work in order to support and realize objects and goals of the organization. The word "office" may also denote a position within an organization with specific d ...
)) which were among the lands restored into the possession of
Gruffydd ap Gwenwynwyn Gruffydd ap Gwenwynwyn (died c. 1286) was a Welsh king who was lord of the part of Powys known as Powys Wenwynwyn and sided with Edward I in his conquest of Wales of 1277 to 1283. Gruffydd was the son of Gwenwynwyn and Margaret Corbet. He was s ...
in return for his homage and
fealty An oath of fealty, from the Latin ''fidelitas'' ( faithfulness), is a pledge of allegiance of one person to another. Definition In medieval Europe, the swearing of fealty took the form of an oath made by a vassal, or subordinate, to his lord. "F ...
by
Llywelyn ap Gruffudd Llywelyn ap Gruffudd (c. 1223 – 11 December 1282), sometimes written as Llywelyn ap Gruffydd, also known as Llywelyn the Last ( cy, Llywelyn Ein Llyw Olaf, lit=Llywelyn, Our Last Leader), was the native Prince of Wales ( la, Princeps Wall ...
at Ystumanner in 1263. Y Gorddwr had remained under the control of the Corbet family (barons of Caus) and therefore the English king. The cantref of Ystlyg (excluding Y Gorddwr) corresponds to the later
hundred 100 or one hundred (Roman numeral: C) is the natural number following 99 and preceding 101. In medieval contexts, it may be described as the short hundred or five score in order to differentiate the English and Germanic use of "hundred" to d ...
of Deuddwr.


References

{{reflist History of Powys Cantrefs