King Llewellyn ap Seisyll of Gwynedd

Llewellyn ap Seisyll of Gwynedd was born in 0980 in Rhuddlan, Flin, Wales.  Llewellyn ap Seisyll of Gwynedd's father was Seisyll ap Ednywain. He had a brother named Llewellyn ap Seisyll of Gwynedd.  He was the older of the two children.  He died at the age of 43 in 1023.

‌Llewellyn ap Seisyll of Gwynedd and Angharad verch Maredudd were married in a religious ceremony in 0994.  They had a son named Gruffudd ap Llywelyn of Gwynedd.