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Tribes of Wales at the time of the Roman invasion.
Exact boundaries are conjectural.

The Demetae were a Celtic people of Iron Age Britain who inhabited modern Pembrokeshiremarker and Carmarthenshiremarker in south-west Walesmarker, and gave their name to the county of Dyfed.

They are mentioned in Ptolemy's Geographia, as being west of the Silures. He mentions two of their towns, Moridunummarker (modern Carmarthenmarker) and Luentinummarker (identified as the Dolaucothi Gold Minesmarker near Pumsaint, Carmarthenshire). They are not mentioned in Tacitus' accounts of Roman warfare in Wales, which concentrate on their neighbours the Silures and Ordovices.

Vortiporius, "tyrant of the Demetae", is one of the kings condemned by Gildas in his 6th century polemic De Excidio Britanniae. This probably signifies the sub-Roman kingdom of Dyfedmarker.


  1. Ptolemy, Geographia 2.2; Demetae at
  2. Gildas, De Excidio Britanniae 31

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