Eleanor of Aragon, Countess of Toulouse
Eleanor of Aragon, Countess of Tolouse( 1182–1226) was a daughter of King Alfonso II of Aragon and Sancha of Castile, Queen of Aragon.
She married Raymond VI, Count of Toulouse.
Martha of Armagnac
Martha of Armagnac (after 18 February 1347 – 23 October 1378) was the youngest child of John I of Armagnac and his second wife Beatrice of Clermont.
She was the first wife of John I of Aragon but never became Queen consort of Aragon because she was outlived by her father-in-law Peter IV of Aragon.
John I, Count of Foix
John I, Count of Foix also known as" Jean de Foix- Grailly"( 1382 – 4 May 1436) was Count of Foix from 1428 until his death in 1436.
He succeeded his mother Isabella, Countess of Foix.
His father was Archambaud de Grailly.
Germaine of Foix
Germaine of Foix( 1488 – 15 October 1536) was queen consort of Aragon as the second wife of Ferdinand II of Aragon, whom she married in 1506 after the death of his first wife, Isabella I of Castile in 1504.
Germaine's father was John of Foix, Viscount of Narbonne and son of Queen Eleanor of Navarre.
Her mother, Marie of Orléans, was the sister of King Louis XII of France.
Joanna of Aragon, Countess of Foix
Joanna of Aragon (October 1375 - September 1407) was the only surviving child of John I of Aragon and his first wife Martha of Armagnac.
She was a member of the House of Aragon and was Countess of Foix by her marriage to Matthew of Foix.
Joanna was born at Daroca, the second of five children born into her father's first marriage.
With his second wife, Violant of Bar, John had only one daughter who lived to adulthood, Yolande.
In Barcelona, on 4 June 1392, Joanna married Matthew of Foix, son of Roger Bernard II, Viscount of Castelbon.
He was her fourth cousin, both being descendants of Peter III of Aragon.
They were married for fifteen years but in this time they had no children.
In 1396 King John died.
He was succeeded by his brother, Joanna's uncle Martin.
However, Sicilian nobles were causing unrest and Martin was kept in Sicily.
In the meanwhile, Martin's wife Maria de Luna claimed the throne on his behalf and acted as his representative until he arrived in 1397.
Still, the delay opened the way for more problems and quarrels to surface in Aragon.
His right to the throne was contested by Matthew and Joanna.
However, Martin succeeded in quashing the invasion by the troops of Matthew and Joanna.
Joanna's younger half-sister Yolande claimed the throne with the support of her mother, despite Joanna still being alive.
They also failed but Yolande married Louis II of Naples and had children who all challenged Martin's rights to the throne.
Joanna, who failed to become Queen of Aragon, died childless in Valencia on September 1407.
After Martin's death Yolande tried again to claim Aragon but failed.
Philippa of Coimbra
Infanta Philippa of Coimbra( 1437 – 1497) was the youngest child of Infante Peter, Duke of Coimbra, and Isabella of Aragon, Countess of Urgell.
She became a nun in the Convent of Odivelas where she died in 1497.
Joan, Countess of Toulouse
Joan( 1220 – Castle of Corneto near Siena, 25 August 1271), was Countess of Toulouse from 1249 until her death.
She was the only child of Raymond VII, Count of Toulouse by his first wife Sancha of Aragon, Countess of Toulouse.
Isabella, Countess of Foix
Isabella of Foix also known as" Isabella of Foix- Castelbon"( before 2 November 1361- 1428) was sovereign Countess of Foix and Viscountess of Béarn from 1399 until 1428.
She was Countess of Foix in her own right, but shared power with her husband and later with her son.
She succeeded as countess along with her husband upon the death of her childless brother Matthew.
Matthew, Count of Foix
Matthew( 1363 – 1398) was a Count of Foix, sovereign Viscount of Béarn as its lord, and military leader.
In 1391. he succeeded Gaston Phoebus, his first cousin once removed, as Count of Foix.
He confirmed the sovereignty of Béarn, also contesting Martin I of Aragon for the throne of Aragon after Martin succeeded John I of Aragon in 1396.
His wife Joanna was the elder daughter of John I of Aragon, but she died childless.
Joanna of Aragon, Countess of Ampurias
Joanna of Aragon( Barcelona 7 November 1344- Castellón, Ampurias 1385) was the second child of Peter IV of Aragon and his first wife Maria of Navarre.
She was an Infanta of Aragon by birth and Countess of Ampurias by her marriage.
She was a member of the House of Aragon.

Question: When did Joanna Of Aragon, Countess Of Foix's mother die?
Answer: 23 October 1378