Caereinion (fort of Einion) was a medieval

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 wer ...

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 ...

, or possibly it was a

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 Wal ...

(''cwmwd'') within a cantref called Llŷs Wynaf. It was divided into the manors of Uwch Coed and Is Coed. It lay towards the south of the kingdom, bordering with the commote of Mochnant Uwch Rhaeadr of the cantref of

Mochnant Mochnant, a name translating as "the rapid stream", was a medieval cantref in the Kingdom of Powys. In the 12th century it was divided into the commotes of Mochnant Is Rhaeadr (in the north) and Mochnant Uwch Rhaeadr (in the south) (''Is'' signif ...

and the cantref of

Mechain Mechain was a medieval cantref in the Kingdom of Powys. This cantref has also been referred to as Y Fyrnwy (''Vyrnwy''). Mechain may owe its name to the River Cain which flows through it on its way to join the River Vyrnwy; 'Me' or 'Mach' (c.f. ...

to the north, the commotes of

Ystrad Marchell Ystrad Marchell sometimes Strad Marchell ( en, Vale of Marchell) was a medieval commote (''cwmwd'') in the cantref of Ystlyg in the Kingdom of Powys. It roughly coincides with the parish of Welshpool. It lay at the east of the kingdom, borderi ...

and Llanerch Hudol in the cantref of

Ystlyg Ystlyg ( en, possibly curve or open country) was a medieval cantref in the Kingdom of Powys. It lay at the east of the kingdom on the border with England. It consisted of the commotes (''cymydau'') of Deuddwr in the north, Ystrad Marchell in the ce ...

to the east, the cantrefi of

Cedewain Cedewain (or Cydewain) was a medieval cantref in the Kingdom of Powys. It possibly consisted of the commotes (''cymydau'') of Cynan, Hafren and Uwch Hanes. Other sources give the commotes as Cedewain, Eginlle and Ceri. It lay at the south of the k ...

to the south and

Cyfeiliog Cyfeiliog was a medieval commote in the cantref of Cynan of the Kingdom of Powys. Cynan also contained the commote of Mawddwy. Other sources refer to Cyfeiliog as a cantref in its own right, possibly as a result of Cynan's being renamed for the la ...

to the west. It roughly 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 des ...

Mathrafal Mathrafal near Welshpool, in Powys, Mid Wales, was the seat of the Kings and Princes of Powys probably from the 9th century until its destruction in 1213 by Prince Llywelyn the Great. Location On the banks of the River Banwy, just above its c ...

Castle Caereinion Castle Caereinion (Welsh: ''Castell Caereinion'') is a small village and community in Montgomeryshire, Powys, Wales upon the River Banwy, around 8 miles west of Welshpool, and 4 miles east of Llanfair Caereinion. In 2011 the ward had a po ...

, Caereinion Fechan,

Llanfair Caereinion Llanfair Caereinion is a market town and community in Montgomeryshire, Powys, Wales upon the River Banwy (also known as the River Einion), around 8 miles west of Welshpool. In 2011 the ward had a population of 1,810; the town itself had a po ...

Llanerfyl Llanerfyl is a village and community in Montgomeryshire, Powys, Wales. Located near the River Banwy, the community includes the village of Llanerfyl, several farms and wide tracts of marchland. The southern part of the community includes Cwm Nant ...

Llangadfan Llangadfan is a small village in Powys, Wales, based in the community of Banwy. The village lies on the A458 between Foel and Llanerfyl, from Llanwddyn. Dyfnant Forest is located nearby. The village is said to be known for its country dances. ...

Llangyniew Llangynyw (also Llangyniew) is a hamlet and community in Montgomeryshire, Powys, mid Wales. It is located on a hill inside a bend in the River Banwy, approximately two miles north-east of Llanfair Caereinion. The community includes the hamlet o ...

and part of

Berriew Berriew ( cy, Aberriw) is a village and community in Montgomeryshire, Powys, Wales. It is on the Montgomeryshire Canal and the Afon Rhiw, near the confluence (Welsh: ''aber'') with the River Severn (Welsh: Afon Hafren) at , 79 miles (128 k ...

are within the territory of this cantref.

References

Cantrefs History of Powys {{Wales-hist-stub