- Matilda FitzRoy
Maud, Abbess of Montivilliers was a natural daughter of Henry I of England and his young mistress Isabel de Beaumont (ca 1102 - ca 1172), herself a sister of Robert de Beaumont, 2nd Earl of Leicester.
Born Matilda Fitzroy, her maternal grandparents were Robert de Beaumont, 1st Earl of Leicester and Elizabeth of Vermandois. She was a half-sister of Richard "Strongbow" de Clare, her mother's son through a marriage to Gilbert de Clare, 1st Earl of Pembroke, and of the Empress Matilda, who apparently valued her company and advice. Perhaps due to their closeness, Matilda or "Maud" is called the Sister of the Empress Matilda.
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