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