Llwelyn ap SEISYLL 
Llwelyn ap was born about 0980 in Rhuddlan, Flintshire, Wales. Llwelyn ap's father was Seisyll ap EDNYWAIN and his mother was Prawst verch ELISE. He was an only child. He died about 1021 in Wales.
They had a son named Gruffydd ap.
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Children
Gruffydd ap LLEWELYN
Gruffydd ap was born about 1011 in Rhuddlan, Flintshire, Wales. He died on August 5th, 1063 in Battkle of Central Wales.