Cateyrn ap Gwrtheyrn Gwr

Cateyrn ap's father was Gwrtheyrn Gwrtheneu ap Gwidol and his mother was Severa Ferch Macsen Wledig.  His paternal grandfather was Gwidol ap Gwiddin; his maternal grandparents were Macsen Wledig and Ceindrech Ferch Rheiden.  He was an only child.