Margaret of Brabant, Countess of Flanders
Margaret of Brabant (9 February 1323 – 1380) was a countess consort of Flanders.
She was the second daughter of Duke John III of Brabant and Mary of Évreux.
She was the only child of Duke John to have children.
In 1347 she married Louis II of Flanders, who was then sixteen years old and already count of Flanders.
On 13 April 1350 their daughter, Margaret III, Countess of Flanders, was baptized.
Through this daughter, their only surviving child, Brabant came under the influence of Burgundy when she married Philip the Bold.
On 26 September 1371, Margaret and her mother-in-law, Margaret of France, countess of Artois, with their attendants, were guests of Philip the Bold, duke of Burgundy for supper in Lens.
Soon afterwards, Margaret left Flanders and went to reside permanently, far from her husband, in the county of Réthel, where she died in April 1380 (after Easter).
Margaret of France, Duchess of Brabant
Margaret of France( 1254–1271) was a daughter of Louis IX of France and his wife Margaret of Provence.
She was a member of the House of Capet and was Duchess of Brabant by her marriage to John I, Duke of Brabant.
Margaret of Flanders, Duchess of Brabant
Margaret of Flanders( died 3 July 1285) was a Duchess consort of Brabant.
She was the daughter of Guy of Dampierre and his first wife Matilda of Béthune.
She married John I, Duke of Brabant in 1273.
She was the mother of:
John III, Duke of Brabant
John III (1300 – 5 December 1355) was Duke of Brabant, Lothier, and Limburg (1312–1355).
He was the son of John II, Duke of Brabant, and Margaret of England.
Margaret I, Countess of Burgundy
Margaret I( 1310 – 9 May 1382), was a ruling Countess Palatine of Burgundy and Artois from 1361 and 1382.
She was also countess of Flanders, Nevers and Rethel by marriage to Louis I, Count of Flanders, and regent of Flanders during the minority of her son Louis II, Count of Flanders in 1346.
Margaret of Brabant
Margaret of Brabant (4 October 1276 – 14 December 1311), was the daughter of John I, Duke of Brabant and Margaret of Flanders.
She was the wife of Count Henry of Luxemburg and after his election as King of Germany in 1308, she became Queen of Germany.
Richilde, Countess of Hainaut
Richilde, Countess of Mons and Hainaut( – 15 March 1086), was a ruling countess of Hainaut from c. 1050 until 1076, in co-regency with her husband Baldwin VI, Count of Flanders and son Baldwin II, Count of Hainaut.
She was also countess consort of Flanders by marriage to Baldwin VI, Count of Flanders.
She served as regent of Flanders during the minority of her son Arnulf III, Count of Flanders in 1070- 1071.
Margaret I, Countess of Flanders
Margaret I of Flanders( c. 1145- died 15 November 1194) was ruling countess of Flanders" suo jure" from 1191 to her death.
She was the daughter of Thierry, Count of Flanders, and Sibylla of Anjou, and the heiress of her childless brother, Philip of Flanders.
Marie of Brabant, Countess of Savoy
Marie of Brabant( 1277/80–1338), was a Countess Consort of Savoy; married in 1297 to Amadeus V, Count of Savoy.
She was the daughter of John I, Duke of Brabant and Margaret of Flanders.
Issue:
Margaret III, Countess of Flanders
Margaret III( 13 April 1350 – 16/21 March 1405) was the last Countess of Flanders of the House of Dampierre, as well as Countess of Artois and Countess of Burgundy( as Margaret II).
She was the only surviving child and heir of Louis II, Count of Flanders( 1346 – 1384) and Margaret of Brabant.

Question: When did Margaret Of Brabant, Countess Of Flanders's father die?
Answer: 5 December 1355