Demetia
A region and former kingdom in southwest Wales, called Demetia by the Romans. It contains the counties of Cardigan, Carmarthen, Pembroke, and St. David’s, which have various Arthurian associations. In the seventh century Dyfed consisted only of Pembrokeshire.
Dyfed is located in the lowest part of the principality, which indicates the root of the word dyfed might be dwfn, which means ‘deep’ or ‘low’. Devon is probably of the same origin.
Dyfed was settled by Irish tribes during the traditional Arthurian period (fifth and sixth centuries). Geoffrey says it was ruled by Stater during the Arthurian period.
| REIGN | RULERS |
| ca. 357 | Anwn |
| ca. 373 | Ednyfed |
| – | Gloitgwyn |
| ca. 405 | Clotri |
| ca. 385 | Triffyn Farfog |
| ca. 437 | Aergol Lawhir |
| ca. 475-540 | Gwrthefyr |
| ca. 585 | Arthwyr |
| ca. 630 | Cloten |
| ca. 690 | Rhein |
| ca. 710 | Tewdos |
| ca. 711-811 | Owain |
| ca. 815-893 | Hyfaidd |
| ca. 893-904 | Llywarch ap Hyfaidd |
| ca. 845-905 | Rhodri |
| ca. 905-909 | Hywel Dda |
See also
Arthur of Dyfed | The Legend of King Arthur
Vortipore | The Legend of King Arthur