Nielsen Hayden genealogy
Ancestors of Gruffudd ab Owain Brogyntyn ap Madog ap Maredudd
┌── Cynfyn ap Gwerystan (Abt 1000 - ??) =>
┌── Bleddyn ap Cynfyn, King of Gwynedd & Powys ( - 1075)
│ └── Angharad ferch Maredudd =>
│
┌── Maredudd ap Bleddyn ap Cynfyn (of Powys, Wales - 1132)
│ │
│ │ ┌── Cillin y Blaidd Rhudd
│ └── Haer ferch Cillin
│
┌── Madog ap Maredudd, Prince of Powys Fadog ( - 1160 Winchester, Hampshire, England)
│ │
│ │ ┌── Einudd ap Morien ap Morgeneu ab Elystan ap Gwaithfoed (Abt 1070 of Dyffryn Clwdd,
│ │ │ Denbighshire, Wales - ??)
│ │ │ Denbighshire, Wales - ??)
│ └── Hunydd ferch Einudd
│
│