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Seisyll, King of Seisyllwg
(Born c.AD 665)
(Latin: Caecilius; English: Cecil)

Seisyll was a direct descendant of King Ceredig Ceredigion's eldest son, King Usai. He was a late 7th century King of Ceredigion who invaded Dyfed and managed to conquer Ystrad Towi. His enlarged kingdom became known as Seisyllwg in his honour.

 

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