Caereinion (fort of Einion) 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 t ...

, 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 Wales ...

(''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'' signi ...

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, borderin ...

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 ...

to the east, the cantrefi of Cedewain to the south and Cyfeiliog 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, 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 popul ...

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 Nan ...

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 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