Llywelyn ap SEISYLL 
Llywelyn ap was born in 0980 in Rhuddian, Flintshire, Wales. Llywelyn ap's father was Seisyll ap EDNYVAIN and his mother was Prawst verch ELISEDD. He was an only child. He died at the age of 41 in 1021.
They had a son named Gruffydd ap.
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Children
Gruffydd ap LLEWELLYN
Gruffydd ap was born about 1000 in Rhudlan, Flintshire, Wales. He died on August 5th, 1063 in Snowdonia, Wales.