Edeirnion or Edeyrnion is an area of the county of

Denbighshire Denbighshire ( ; cy, Sir Ddinbych; ) is a county in the north-east of Wales. Its borders differ from the historic county of the same name. This part of Wales contains the country's oldest known evidence of habitation – Pontnewydd (Bontnewy ...

and an ancient

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 Wales ...

medieval Wales {{Commons category Period Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to t ...

in the

cantref A cantref ( ; ; plural cantrefi or cantrefs; also rendered as ''cantred'') was a medieval Welsh land division, particularly important in the administration of Welsh law. Description Land in medieval Wales was divided into ''cantrefi'', which were ...

of Penllyn. According to tradition, it was named after its eponymous founder Edern or Edeyrn. It was included as a Welsh territory of

Shropshire Shropshire (; alternatively Salop; abbreviated in print only as Shrops; demonym Salopian ) is a landlocked historic county in the West Midlands region of England. It is bordered by Wales to the west and the English counties of Cheshire to th ...

in the

Domesday Book Domesday Book () – the Middle English spelling of "Doomsday Book" – is a manuscript record of the "Great Survey" of much of England and parts of Wales completed in 1086 by order of King William I, known as William the Conqueror. The manusc ...

. Edeirnion was nominally a part of 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 ...

but was often subject to border intrusions by the neighbouring

Kingdom of Gwynedd The Kingdom of Gwynedd (Medieval Latin: ; Middle Welsh: ) was a Welsh kingdom and a Roman Empire successor state that emerged in sub-Roman Britain in the 5th century during the Anglo-Saxon settlement of Britain. Based in northwest Wales, th ...

. It was the patrimony of

Owain Brogyntyn Owain ''Brogyntyn'' ap Madog (fl. 1160–1186) was the third and illegitimate son of king Madog ap Maredudd, the last king of a united Kingdom of Powys. He was the son of Madog by the daughter of the ''Maer du'' or "black mayor" of Rûg in ...

. These rumbling border disputes caused a great deal of friction between the two realms. Edeirnion was occupied and annexed by Gwynedd in the reign of

Llywelyn the Great Llywelyn the Great ( cy, Llywelyn Fawr, ; full name Llywelyn mab Iorwerth; c. 117311 April 1240) was a King of Gwynedd in north Wales and eventually " Prince of the Welsh" (in 1228) and "Prince of Wales" (in 1240). By a combination of war and d ...

but briefly returned to Powys following a treaty forced on Gwynedd by England after Llywelyn's death in 1240. The territory was again occupied by Gwynedd after 1267 before being returned again to Powys. This continuing dispute and the appeal 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 ...

Edward I of England Edward I (17/18 June 1239 – 7 July 1307), also known as Edward Longshanks and the Hammer of the Scots, was King of England and Lord of Ireland from 1272 to 1307. Concurrently, he ruled the duchies of Aquitaine and Gascony as a vassa ...

to see the resolution of this dispute settled by

Welsh Law Welsh law ( cy, Cyfraith Cymru) is an autonomous part of the English law system composed of legislation made by the Senedd.Law Society of England and Wales (2019)England and Wales: A World Jurisdiction of Choice eport(Link accessed: 16 March 2022 ...

was one of the reasons the principalities in the north of Wales were unable to unite in opposition to English hegemony and was a contributing factor to the final war between the

Principality of Wales The Principality of Wales ( cy, Tywysogaeth Cymru) was originally the territory of the native Welsh princes of the House of Aberffraw from 1216 to 1283, encompassing two-thirds of modern Wales during its height of 1267–1277. Following the con ...

and England, which ultimately saw the end of Welsh independence. Edeirnion still exists as a ''bro'', or region, in Denbighshire, located around

Corwen Corwen is a town and community in the county of Denbighshire in Wales. Historically, Corwen is part of the county of Merionethshire. Corwen stands on the banks of the River Dee beneath the Berwyn mountains. The town is situated west of Llango ...

and near the

Berwyn Range The Berwyn range ( Welsh: ''Y Berwyn'' or ''Mynydd y Berwyn'') is an isolated and sparsely populated area of moorland in the northeast of Wales, roughly bounded by Llangollen in the northeast, Corwen in the northwest, Bala in the southwest, a ...

Edeirnion Rural District

Edeirnion Rural District was created under the

Local Government Act 1894 The Local Government Act 1894 (56 & 57 Vict. c. 73) was an Act of the Parliament of the United Kingdom that reformed local government in England and Wales outside the County of London. The Act followed the reforms carried out at county level un ...

from that part of Corwen Rural Sanitary District which was in the former administrative county of

Merionethshire , HQ= Dolgellau , Government= Merionethshire County Council (1889-1974) , Origin= , Status= , Start= 1284 , End= , Code= MER , CodeName= ...

. It consisted of six

civil parish In England, a civil parish is a type of administrative parish used for local government. It is a territorial designation which is the lowest tier of local government below districts and counties, or their combined form, the unitary authority ...

es and covered ; it continued in existence until 1974, when it was abolished, as a result of the

Local Government Act 1972 The Local Government Act 1972 (c. 70) is an Act of the Parliament of the United Kingdom that reformed local government in England and Wales on 1 April 1974. It was one of the most significant Acts of Parliament to be passed by the Heath Gov ...

, becoming part of the Glyndŵr District of

Clwyd Clwyd () is a preserved county of Wales, situated in the north-east corner of the country; it is named after the River Clwyd, which runs through the area. To the north lies the Irish Sea, with the English ceremonial counties of Cheshire to th ...

. In 1901 it had a population of 5,132, which had fallen to 3,925 by 1961.A Vision of Britain Through Time : ''Edeirnion Rural District''
Retrieved 11 January 2010 It was the only part of Merionethshire not included in the Meirionnydd District of

Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, and C ...

. In 1996 Edeirnion became part of

List of former civil parishes

References

Commotes Geography of Denbighshire Former subdivisions of Wales History of Gwynedd Merionethshire {{Denbighshire-geo-stub