Charles, Prince of La Roche-sur-Yon
Charles de Bourbon, Prince de la Roche- sur- Yon, born 1515, died in 1565 in Beaupré, was a prince of the blood of the House of Bourbon.
He was the younger son of Louis de Bourbon, Prince of La Roche- sur- Yon, and Louise de Bourbon, Duchess of Montpensier.
He served with his elder brother Louis, Duke of Montpensier, in the wars against Emperor Charles V, in Provence( 1536), Artois( 1537), in Roussillon( 1542) and Champagne( 1544).
He was captured near Chalons- sur- Marne.
Released, he was part of the expedition charged with defending Metz, besieged by Charles V in 1552, then he joined Henry II besieging Renti in Artois.
During the French wars of religion, he served in the royal army and took part in the sieges of Bourges and Rouen( 1562).
A familiar of Queen Catherine de' Medici, he, unlike his brother, a moderate Catholic, opposed the party of Guise.
He married in 1544 Philippe de Montespedon, dame de Beaupré( † 1578), but their children predeceased him:
Anne Marie Louise d'Orléans, Duchess of Montpensier
Anne Marie Louise d' Orléans, Duchess of Montpensier, known as La Grande Mademoiselle, was the only daughter of Gaston d' Orléans with his first wife Marie de Bourbon, Duchess of Montpensier.
One of the greatest heiresses in history, she died unmarried and childless, leaving her vast fortune to her cousin, Philippe of France.
After a string of proposals from various members of European ruling families, including Charles II of England, Afonso VI of Portugal, and Charles Emmanuel II of Savoy, she eventually fell in love with the courtier Antoine Nompar de Caumont and scandalised the court of France when she asked Louis XIV for permission to marry him, as such a union was viewed as a" mésalliance".
She is best remembered for her role in the" Fronde", her role in bringing the famous composer Lully to the king's court, and her" Mémoires".
Louis II, Count of Montpensier
Louis de Bourbon, Count of Montpensier( 1483 – August 14, 1501, Naples) was the son of Gilbert, Count of Montpensier and Claire Gonzaga.
He was Count of Montpensier and Clermont- en- Auvergne and Dauphin d'Auvergne from 1496 to his death.
He died unmarried and was succeeded by his brother Charles III, Duke of Bourbon.
Louis, Prince of La Roche-sur-Yon
Louis de Bourbon( 1473 – 1520) styled as the" Prince of La Roche- sur- Yon" was born in 1473.
He was the son of John II, Count of Vendôme and Isabel de Beauveau.
He married his cousin, Louise de Bourbon, Duchess of Montpensier, eldest daughter of Gilbert of Bourbon, Count of Montpensier and Clara Gonzaga, on 21 March 1504, by whom he had three children.
He died in 1520.
Henri, Duke of Montpensier
Henri de Bourbon, Duke of Montpensier, (12 May 1573 – 27 February 1608) was Dauphin of Auvergne, Duke of Montpensier, Sovereign Prince of the Dombes and Lord of Châtellerault.
Henri was born at Mézières, the son of François de Bourbon, Duke of Montpensier, and of his wife Renée d'Anjou, "marquise de Mézières".
On 15 May 1597, Henri married Henriette Catherine, daughter of Henri de Joyeuse and Catherine de Nogaret.
They had one child:
Infanta Luisa Fernanda, Duchess of Montpensier
Infanta María Luisa Fernanda of Spain, Duchess of Montpensier( 30 January 1832 – 2 February 1897) was Infanta of Spain and Duchess of Montpensier.
She was the youngest daughter of King Ferdinand VII of Spain and his fourth wife Maria Christina of the Two Sicilies, the queen- regent, who was also his niece.
Gilbert, Count of Montpensier
Gilbert de Bourbon, Count of Montpensier( 1443 – 15 October 1496, Pozzuoli) was the son of Louis de Bourbon and Gabrielle La Tour, Count of Montpensier and Dauphin d'Auvergne.
He was appointed to the Order of Saint Michael by Charles VIII in October 1483.
Marie de Bourbon, Duchess of Montpensier
Marie de Bourbon (15 October 1605 – 4 June 1627), Duchess of Montpensier, and Duchess of Orléans by marriage, was a French noblewoman and one of the last members of the House of Bourbon-Montpensier.
Her parents were Henri de Bourbon, "Duke of Montpensier" and Henriette Catherine de Joyeuse, Duchess of Joyeuse in her own right.
Henriette Catherine de Joyeuse
Henriette Catherine de Joyeuse (8 January 1585 – 25 February 1656) was the daughter of Henri de Joyeuse and Catherine de Nogaret.
She married her first husband, Henri de Bourbon, Duke of Montpensier, on 15 May 1597 and her second husband, Charles, Duke of Guise, on 6 January 1611.
Renée of Bourbon
Renée of Bourbon, Duchess of Lorraine( 1494 – 26 May 1539), also called, Renée, Lady of Mercœur, was a Duchess consort of Lorraine.
She was a daughter of Gilbert de Bourbon, Count of Montpensier by Clara Gonzaga, and sister of Charles de Bourbon, Duke of Bourbon.

Question: What is the date of birth of Marie De Bourbon, Duchess Of Montpensier's mother?
Answer: 8 January 1585