Pedigree

            /Reginald de Courtenay
        /Robert de Courtenay
       |    \Hawise de Courcy
    /Baron Okehampton Sir John de Courtenay
   |   |    /5th Earl Devon William de Reviers
   |    \Mary de Reviers
   |        \Mabile de Beaumont
Baron Okehampton Sir Hugh de Courtenay
   |        /3rd Earl Oxford Robert de Vere
   |    /4th Earl Oxford Hugh de Vere
   |   |    \Isabella de Bolbec
    \Isabelle de Vere
       |    /1st Earl Winchester Saher de Quincy
        \Hawise de Quincy
            \Margaret de Beaumont Heiress of Groby

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