Seisyll Ap Endywain
Seisyll was born about 0938 in Of,,,Wales.

 Prawst Verch Elise
Prawst was born about 0940 in Of,,Gwynedd,Wales.

 King Llewelyn Ap Seisyll Of Gwenyd
Llewelyn was born in 0980 in Of,Rhuddlan,Flintshire,Wales.¹   He died at the age of 43 in 1023.¹ 

 Cynan Ap Seisyll
Cynan was born about 0984 in Of,,,Wales.  He died in 1027.