Cantref Mawr was a

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 south-west

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

. It was of strategic importance in medieval Wales as the location of the main seat of the princes of

Deheubarth Deheubarth (; lit. "Right-hand Part", thus "the South") was a regional name for the realms of south Wales, particularly as opposed to Gwynedd (Latin: ''Venedotia''). It is now used as a shorthand for the various realms united under the House o ...

at Dinefwr. ''Cantref Mawr'' means "The Great Cantref". Each cantref in medieval Wales was divided into cwmwdau, and a typical cantref would be made up of two or three cwmwd. Cantref Mawr was made up of seven cwmwdau, which made it one of the largest cantrefs in Wales. Cantref Mawr was an upland area, bounded by the rivers Tywi, Teifi and Gwili. The area at this period was covered in dense scrub which caused difficulties for invading armies, so that the Cantref Mawr often provided a secure refuge for the princes of Deheubarth when facing an invasion.

References

Lloyd, J.E. (1911) ''The history of Wales from the earliest times to the Edwardian conquest'' (Longman, Green & Co.) Cantrefs {{Wales-hist-stub