House of Griffith

Cadet Branches
House of Tudur
Lords of Trecastell and Penmynydd
Seneschals of Gwynedd
Issued from Gronwy ap Ednyfed Vychan, eldest son of Ednyfed Fychan from his 2nd marriage
House Williams of Penrhyn
Lords of Cochwillan and Bodfari
Lords and Baronets of Penrhyn
Issued from Robin, 3rd son of Gruffudd ap Gwilym, Lord of Nant-y-Nef and Penrhyn
House Williams of Vaynol
Lords and Baronets of Vaynol
Issued from Thomas, 3rd son of William Williams, Lord of Cochwillan

Personal Arms
Ednyfed Fychan
Lord of Tregarnedd
Seneschal of Gwynedd
Progenitor of Griffith, Williams and Tudor families