Blanche de Brienne, Baroness Tingry

Blanche de Brienne, Baroness Tingry (c. 1252 – c. 1302) was the wife of William II de Fiennes, Baron of Tingry (c. 1250 – 11 July 1302). She was also known as Dame de La Loupeland, and Blanche of Acre.

Blanche was born in about the year 1252 in France. She was the only child and heiress of Jean de Brienne, Grand Butler of France, and his first wife, Jeanne, Dame de Chateaudun, widow of Jean I de Montfort. Her paternal grandparents were John of Brienne, King of Jerusalem, Emperor of Constantinople, and Berenguela of Leon, and her maternal grandparents were Geoffrey VI, Viscount de Chateaudun and Clémence des Roches. Blanche had a uterine half-sister Beatrice de Montfort, Countess of Montfort-l'Amaury from her mother's first marriage to Jean I de Montfort (died 1249 in Cyprus). In 1260, Beatrice married Robert IV of Dreux, Count of Dreux, by whom she had six children.

Blanche was co-heiress to her mother, by which she inherited Loupeland in Maine.

In the year 1269, Blanche married William II de Fiennes, Baron of Tingry and Fiennes, son of Enguerrand II de Fiennes and Isabelle de Conde. His other titles included Lord of Wendover, Buckinghamshire, of Lambourne, Essex, of Chokes and Gayton, Northamptonshire, of Martock, Somerset, of Carshalton and Clapham, Surrey, and custodian of the county of Ponthieu. The settlement for the marriage had been made in February 1266/67. William and Blanche had at least one son and two daughters:

Blanche is ancestress of Edward IV and all subsequent English monarchs. Her other descendants include Lady Margaret Beaufort (mother of King Henry VII) and queen consorts Elizabeth Woodville, Lady Anne Neville, Anne Boleyn, Jane Seymour, Catherine Howard, and Catherine Parr.