William Thornton III Royal Lines
Descended from royalty via the following lines, among others:
- King Henry I of England (+ mistress)
- Earl Robert de Caen of Gloucester (+Mabel Fitzhamon)
- Maud FitzRobert (+Earl Ranulph des Gernons of Chester)
- Earl Hugh de Cyveiliog des Meschines
- Amicia of Chester (+Sir Ralph de Mainwaring of Chester)
- Bertred Mainwaring (+Henry de Audley)
- James de Audley (+Ela de Longespee)
- Lord Hugh de Audley (+Isolt de Mortimer
- Alice de Audley of Oxfordshire (+Baron Ralph de Neville)
- Baron John de Neville of Raby (+Maud de Percy
- Earl Ralph de Neville of Westmoreland (+Margaret de Stafford)
- Matilda Neville (+John Godard)
- Agnes Godard
- Elizabeth Stapleton (+William Plumpton)
- Agnes Plumpton (+Richard Addleborough)
- Agnes Addleborough (+William Thornton)
- Robert Thornton (+Jane Layton)
- Francis Thornton (+Joan Delovier)
- William Thornton I of Eastcombe (+Barbara Westby)
- William Thornton II (+Frances Robinson)
- William Thornton III
- King Louis IV of France (+Gerbege of Saxony)
- Duke Charles of Upper Lorraine (+Duchess Bonne Adelaide of Lorraine)
- Gerbega of Brabant (+Count Lambert I of Brabant)
- Count Lambert II of Brabant (+Oda of Lorraine)
- Henry II of Brabant (+Countess Adela von Thuringia of Beteau)
- Duke Godfrey VII Barbutus of Lovain & Brabant (+Ida of Namur)
- Josceline de Louvain (+Agnes de Percy)
- Henry de Percy (+Isabel de Brus)
- William de Percy (+Ellen de Balliol)
- Baron Henry de Percy (+Alainore de Warrene)
- Baron Henry de Percy (+Elenor FitzAlan de Arundel)
- Baron Henry de Percy (+Idoine de Clifford)
- Isabella Percy
- Catherine Aton
- Robert Eure
- Elizabeth Eure
- Ann Bulmer
- Thomas Delovier of Bransby
- Joan Delovier (+Francis Thornton)
- William Thornton I of Eastcombe (+Barbara Westby)
- William Thornton II (+Frances Robinson)
- William Thornton III
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