Nielsen Hayden genealogy
Ancestors of Iorwerth ap Madog ap Gruffudd ab Owain Brogyntyn
┌── Maredudd ap Bleddyn ap Cynfyn (of Powys, Wales - 1132) =>
┌── Madog ap Maredudd, Prince of Powys Fadog ( - 1160 Winchester, Hampshire, England)
│ └── Hunydd ferch Einudd =>
│
│
│
┌── Madog ap Gruffudd ab Owain Brogyntyn ap Madog (Abt 1200 - ??)
│ │
│ │ ┌── William Say
│ └── Jonet Say
│