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The land of the Demetae people at the time of the Roman invasions. The kingdom may have been founded by Irish immigrants, the Deisi, in post‐Roman times; its royal dynasty lasted until Llywarch ap Hyfaidd's death (904), when his daughter's husband Hywel Dda, son of the king of neighbouring Seisyllwg, succeeded; Dyfed then became part of the larger Deheubarth.

Subjects: Religion — British History.

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