Conan III, Duke of Brittany
Conan III, also known as Conan of Cornouaille and Conan the Fat (c. 1093–1096 – September 17, 1148) was duke of Brittany, from 1112 to his death.
He was the son of Duke Alan IV and Ermengarde of Anjou.
Conan III allied himself with Stephen of England in Stephen's war against the dispossessed Empress Matilda.
Matilda FitzRoy, Duchess of Brittany
Maud or Matilda Fitzroy, was a duchess consort of Brittany by her marriage to Conan III, Duke of Brittany.
She was an illegitimate daughter of Henry I of England by one of his unknown mistresses.
Doria Ragland
Doria L. Ragland( born September 2, 1956) is the mother of Meghan, Duchess of Sussex, the mother- in- law of Prince Harry, and the maternal grandmother of Archie Mountbatten- Windsor, who is seventh in line to the British throne.
She is a former makeup artist, business owner, yoga instructor, and former social worker who worked in the mental health sector from 2015 to 2018.
Margaret of Huntingdon, Duchess of Brittany
Margaret of Huntingdon( 1145–1201) was a Scottish princess and Duchess of Brittany.
She was the sister of Scottish kings Malcolm IV and William I, wife of Conan IV, Duke of Brittany, and the mother of Constance, Duchess of Brittany.
Her second husband was Humphrey de Bohun, hereditary Constable of England.
Following her second marriage, Margaret styled herself as the Countess of Hereford.
Maria Thins
Maria Thins( c. 1593 – 27 December 1680) was the mother- in- law of Johannes Vermeer and a member of the Gouda Thins family.
Priscilla Pointer
Priscilla Marie Pointer( born May 18, 1924) is an American stage, film and television character actress.
She began her career in the theater, including productions on Broadway.
Later, Pointer moved to Hollywood to act in films and on television.
She is the mother of Amy Irving, therefore making her the former mother- in- law of filmmakers Steven Spielberg and Bruno Barreto and the mother- in- law of documentary filmmaker Kenneth Bowser, Jr.
Mary FitzRoy, Duchess of Richmond and Somerset
Mary FitzRoy, Duchess of Richmond and Somerset( Howard; 1519 – 7 December 1557), born Lady Mary Howard, was the only daughter- in- law of King Henry VIII of England, being the wife of his only acknowledged illegitimate son, Henry FitzRoy, 1st Duke of Richmond and Somerset.
Isabella FitzRoy, Duchess of Grafton
Isabella Bennet FitzRoy, Duchess of Grafton and later 2nd Countess of Arlington" suo jure"( c. 1668 – 7 February 1723), was a British peer and heiress.
Eldon Howard
Eldon Howard was a British screenwriter.
She was the mother- in- law of Edward J. Danziger and wrote a number of the screenplays for films by his company Danziger Productions.
Marian Shields Robinson
Marian Lois Robinson( née Shields; born July 29, 1937) is the mother of Michelle Obama, former First Lady of the United States, and Craig Robinson, a basketball executive, and the mother- in- law of former U.S. President Barack Obama.

Question: Who is the mother-in-law of Matilda Fitzroy, Duchess Of Brittany?
Answer: Ermengarde of Anjou