Seisyll ap Ednywain 
He had a biological son named Llewellyn ap Seisyll of Gwynedd.
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Children
King Llewellyn ap Seisyll of Gwynedd
Llewellyn ap Seisyll of Gwynedd was born in 0980 in Rhuddlan, Flin, Wales. He died at the age of 43 in 1023.
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