References for Simon II. 3rd Earl, 4th Earl of St.Liz * of Huntingdon * of Northampton

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E. Brandenburg: Die Nachkommen Karls des Grossen. Leipzig 1936, Frankfurt 1964
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
D.Schwennicke: Europäische Stammtafeln, Vol. III/4, Tafel 701. Marburg, 1989