Science Fair Project Encyclopedia
Seisyllwg was a kingdom of medieval Wales.
Seisyll (born c. 665) 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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