Nielsen Hayden genealogy
Ancestors of William I Bertram
- Aft 1135 ┌── Richard Bertram (of Mitford Castle, Morpeth, Northumberland, England - ??)
William I Bertram (of Mitford, Morpeth, Northumberland, England - Aft 26 Dec 1135)
│ ┌── John de Mitford (of Mitford Castle, Morpeth, Northumberland, England - ??)
└── Sigel de Mitford