Gwrgan Fawr Ap cynfyn

Gwrgan Fawr was born about 0600.  Gwrgan Fawr's father is Cynfyn Glafrog Ap Peibio.  His paternal grandparents are Peibio Glafrog () and () Verch Custennin.  He is an only child.

He has a biological daughter named Onbrawst Fawr.