3rd cousin Robert II "the Pious" Capet de France -> Alice de France -> Matilda de Flandre -> Henry I Beauclerc (King of England 1100-1135) -> Adelaide Of Angers 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.