3rd cousin 25 times removed Robert II "the Pious" Capet de France -> Alice de France -> Matilda de Flandre -> Henry I Beauclerc (King of England 1100-1135) -> (Matilda) MAUD -> Henry II PLANTAGENET -> John I [O8] PLANTAGENET -> HENRY III [SB19] Plantagenet -> EDWARD I [Sb20] Plantagenet -> Joan PLANTAGENET -> Eleanor or Alianore de CLARE -> Edward DESPENSER -> Edward DESPENSER -> Thomas DESPENSER -> Isabel DESPENSER -> Elizabeth BEAUCHAMP -> George NEVILL -> Edward Neville -> Katherine Neville -> Martha Throckmorton -> George Lynne -> Martha Lynne -> John Blennerhassett -> John Blennerhassett -> John Blennerhassett -> Agnes Blennerhassett -> Jane Denny -> Edward Denny -> Henry Denny Robert II "the Pious" Capet de France -> Henri I Capet de France -> Hugh Capet Magnus de Crepy -> Isabel de Crepy de Vermandois -> Elizabeth de Beaumont
Before her marriage, she was the youngest mistress of Henry I. She bore him a daughter, Elizabeth (Isabel), in about 1129. She took this daughter with her when she married Gilbert de Clare.