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Sir William St John

William's father was Sir Robert De of Basing St John and his mother was Agnes de Cantelou Cantilupe. His paternal grandparents were William St John and Godechild Paynell; his maternal grandparents were <Unknown> and <Unknown>. He had two brothers and a sister, named John de, William and Jane.

Ancestor Pedigree Chart
- Henry De Port ^*
  
  John De Port
  - b.~  1121 d.~  1167
  
  Hawise De Basing
  
  Adam de Port
  
  William St John
  - b.~  1173 in Portchester Castle, Basing, Hampshire, England d.1239 in Portchester Castle, Basing, Hampshire, England
  
  Reginald De Aurevalle
  
  Mabel De Aurevalle
  
  Roger De St John
  
  Muriel St John
  
  Cecily
  
  Sir Robert De of Basing St John
  - b.~  1199 in Basing, Hampshire, England d.~Mar 1270 in Basing, Hampshire, England
  
  Godechild Paynell
  - b.~  1170 in Portchester Castle, Basing, Hampshire, England d.~  1286 in Basing, Hampshire, England
  
  Sir William St John
  
  Agnes de Cantelou Cantilupe
  - b.~  1202 in Kenilworth Castle, Warwickshire, England
  
  ^*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)

Details of William's family with Isabel Cobmartin