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, Countess of Anjou
Margaret, Countess of Anjou( 1272 – 31 December 1299) was Countess of Anjou and Maine in her own right and Countess of Valois, Alençon, Chartres and Perche by marriage.
Margaret's father was King Charles II of Naples, whilst her husband was Charles of Valois, and her older brother was Saint Louis of Toulouse; her nephew was Charles I of Hungary.
Gertrude of Saxony
Gertrude of Saxony (1030 – August 4, 1113), also known as Gertrude Billung, was a countess of Holland by marriage to Floris I, Count of Holland, and countess of Flanders by marriage to Robert I, Count of Flanders.
She was regent of Holland in 1061-1067 during the minority of her son Dirk V, and regent of Flanders during the absence of her spouse in 1086-1093.
Margaret, Countess of Vertus
Margaret, Countess of Vertus( French:" Marguerite d' Orléans"; 4 December 1406 – 1466), was a French vassal, Countess of Vertus and Etampes 1420 – 1466.
She was the daughter of Louis I, Duke of Orléans, and Valentina Visconti.
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 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.
Serena Armstrong-Jones, Countess of Snowdon
Serena Alleyne Armstrong- Jones, Countess of Snowdon(" née" Stanhope; born 1 March 1970) is an Anglo- Irish aristocrat and the daughter- in- law of Princess Margaret, Countess of Snowdon, and a niece- by- marriage of Queen Elizabeth II and Prince Philip, Duke of Edinburgh.
Thierry, Count of Flanders
Theoderic (– 17 January 1168), commonly known as Thierry of Alsace, was the fifteenth count of Flanders from 1128 to 1168.
He was the youngest son of Duke Theoderic II of Lorraine and Gertrude of Flanders (daughter of Robert I of Flanders).
With a record of four campaigns in the Levant and Africa (including participation in the Second Crusade, the failed 1157–1158 siege of the Syrian city Shaizar, and the 1164 invasion of Egypt), he had a rare and distinguished record of commitment to crusading.
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.
Baldwin V, Count of Flanders
Baldwin V of Flanders( c. 1012 – 1 September 1067) was Count of Flanders from 1035 until his death.
He was the son of Baldwin IV, Count of Flanders, who died in 1035.

Question: When did Margaret I, Countess Of Flanders's father die?