Other Events and Attributes:

• Appointments / Titles: Baroness Mortimer
• FSID: 9MB1-BY8

Notes:

Margaret de Fiennes (after 1269 – 7 February 1333), was a French noblewoman who married an English marcher lord, Edmund Mortimer, of Wigmore, and was mother of Roger Mortimer, 1st Earl of March.

Origins
She was a daughter of Guillaume II de Fiennes (died 1302) and his wife Blanche, the daughter of Jean de Brienne (died 1296), Grand Butler of France, and his first wife Jeanne de Châteaudun (his second marriage was to Marie de Coucy, widow of King Alexander II of Scotland).

Her grandfather Jean was the third son of John of Brienne, King of Jerusalem and Emperor of Constantinople, and his third wife Berengaria of León, which made Margaret a cousin of Queen Eleanor of Castile. Her paternal grandparents were Enguerrand II de Fiennes and Isabel de Condé.

Her brother Jean (died 1340) married Isabel, daughter of Guy de Dampierre, Count of Flanders and his second wife Isabel of Luxembourg.

Life
In September 1285, when she was fourteen or fifteen years old, Margaret married Edmund Mortimer, the second son of Roger Mortimer, 1st Baron Mortimer and his wife Maud de Briouze. He had succeeded to his father's lands and barony in 1282 and was already a national hero after killing Llywelyn ap Gruffudd, his cousin, in battle. They had eight known children.

Her husband died in 1304 and she lived until 1333, probably being buried in Wigmore Abbey.

https://en.wikipedia.org/wiki/Margaret_Fiennes,_Baroness_Mortimer

Margaret married de Mortimer, Baron Edmund I in Sep 1285 in Wigmore, Herefordshire, England. Edmund (son of de Mortimer, Baron Roger and de Braose, Maud) was born on 27 Oct 1252 in Wigmore Castle, Wigmore, Herefordshire, England; died on 17 Jul 1304 in Wigmore Castle, Wigmore, Herefordshire, England; was buried after 17 Jul 1304 in Wigmore Castle, Wigmore, Herefordshire, England. [Group Sheet] [Family Chart]

1. de Mortimer, Roger was born on 25 Apr 1287 in Wigmore Castle, Wigmore, Herefordshire, England; was christened on 3 May 1287 in Thornbury, Herefordshire, England; died on 29 Nov 1330 in Tyburn, London, England; was buried after 29 Nov 1330 in Wigmore Abbey, Wigmore, Herefordshire, England.

Other Events and Attributes:

• Appointments / Titles: Baron of Tingry
• Appointments / Titles: Chevalier of Hachin
• Appointments / Titles: Ponthieu (Historical), Picardie, France; Custodian of the county of Ponthieu
• Appointments / Titles: Lord of Wendover
• Life Event: Acted as hostage in negotiations between England and France
• FSID: KFKV-97C
• Military: 11 Jul 1302, Couptrain, Mayenne, Pays de la Loire, France; Battle of Couptrain

Notes:

Biography
Seigneur of Fiennes and Tingry (Pas-de-Calais), and, in England, of the Chokes (Chocques) fee including Gayton, Northamptonshire; Wendover, Buckinghamshire; Fyfield and Lambourne, Essex; etc.

He was slain at the Battle of Courtrai, aka Kortrijk, which was also known as the Battle of the Golden Spurs.

Died:
Battle of the Golden Spurs

William married de Brienne, Blanche in 1268. Blanche was born in 1252 in Mayenne, Pays de la Loire, France; died on 11 Jun 1302 in Louplande, Sarthe, Pays de la Loire, France; was buried after 11 Jun 1302 in Couptrain, Mayenne, Pays de la Loire, France. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Appointments / Titles: Louplande, Sarthe, Pays de la Loire, France; Lady of Loupland
• FSID: 9CHH-WJS
• Appointments / Titles: 1269; Baroness of Tingery
• Appointments / Titles: 1275, Maubuisson, Gironde, Aquitaine, France; Abbesse de Maubuisson

Notes:

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.

Family
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.

Marriage and issue
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:
1. Jean de Fiennes, Seigneur of Fiennes and Tingry (b. before 1281 in France – 1340), in 1307 married Isabelle de Dampierre, daughter of Guy de Dampierre, Count of Flanders and Isabelle of Luxembourg. They had a son Robert, who was Constable of France, and two daughters, Jeanne de Fiennes who married Jean de Châtillon, Count of Saint-Pol, and Mahaut de Fiennes who married Jean de Bournonville.
2. Joan de Fiennes (d. before 26 October 1309), in 1291 married John Wake, 1st Baron Wake of Liddell. Had issue, including Margaret Wake, 3rd Baroness Wake of Liddell, mother of Joan of Kent and grandmother of Richard II of England.
3. Margaret de Fiennes (b. after 1269 – 7 February 1333), in September 1285, married Edmund Mortimer, 2nd Baron Wigmore. They had three children, including Roger Mortimer, 1st Earl of March.

She married William de la Planche (1240 - 1302) and had at least one son:
1. James de la Planche (1265 - 1306)

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.

Blanche de Brienne died on an unknown date around the year 1302. Her husband William was killed on 11 July 1302 at the Battle of Courtrai.

https://en.wikipedia.org/wiki/Blanche_de_Brienne,_Baroness_Tingry