• General Notes

  Of these [the children of John FitzWilliam & Eleanor Greene] the younger John is said to have been of Green's Norton, and the ancestor of the Milton FitzWilliams.
  
  Reverting to John FitzWilliam of Green's Norton, the alleged 6th son of Sir John of Emley, I have never found any references to him in any document, and neither he nor his family are mentioned in any of the numerous fifteenth-century wills of members of the Yorkshire branches of the family.  This, of course, does not prove his non-existence, but I doubt if he could have been the father of Sir William who bought Milton. John cannot have been born, at the latest, more than a few months after his father's death on 5 July 1417, and it may have been some years earlier (his eldest brother, the first John, was born 15 Aug 1397).  I do not know when Sir William I of Milton was born--his age is not given on his brass at Marham--but his son, Sir William II of Milton, was born in 1503 or 1504.  We have thus a period of 86 years to cover only two generations; it is not phyically impossible, but demands strict proof. [Complete Peerage V:518-520 Note]
  
  NOTE: Since CP doesn't find any documents on him, I don't believe that he held Greene's Norton, as that property seemed to descend to Henry Greene of Drayton's brother, Thomas, and to his heirs.  And he didn't hold Gainspark (Gaynes Park Hall) as so many people state, because his son William didn't purchase Gaynes Park until April 1508.  So I am placing him at Milton.

Details of John's family with Helen (Ellen\Eleanor) Villiers