Eleanor of Castile, Queen of Navarre
Eleanor of Castile( after 1363 – 27 February 1416) was an infanta of Castile and the Queen consort of Navarre.
She was the daughter of King Henry II of Castile and his wife, Juana Manuel of Castile, from a cadet branch of the Castilian royal house.
Eleanor was a member of the House of Trastámara.
María de Padilla
María Díaz de Padilla (1334 –Seville, July 1361) was the mistress of King Peter of Castile.
Constance of York, Countess of Gloucester
Constance of York, Countess of Gloucester( – 28 November 1416) was the only daughter of Edmund of Langley, 1st Duke of York and his wife Isabella of Castile, daughter of King Peter of Castile and his favourite mistress, María de Padilla.
Alys of France, Countess of Vexin
Alys of France,( or Alice) Countess of Vexin( 4 October 1160 – c. 1220) was the daughter of Louis VII, King of France and his second wife, Constance of Castile.
Constance of Arles
Constance of Arles( c. 986 – 28 July 1032), also known as Constance of Provence, was queen of France as the third spouse of King Robert II of France.
Violante Manuel
Violante Manuel of Castile( c. 1265 – Lisbon, 1314) was a Castilian noble, daughter of Manuel of Castile and his first wife Constance of Aragon.
She was Lady of Elche, Elda, Novelda, Medellín and half of Peñafiel in her own right.
Elizabeth of Lancaster, Duchess of Exeter
Elizabeth of Lancaster( bf. 21 February
1363 – 24 November 1426) was the third child of John of Gaunt, 1st Duke of Lancaster, and his first wife Blanche of Lancaster.
Constance of Castile, Duchess of Lancaster
Constance of Castile (1354 – 24 March 1394) was claimant of the Castilian throne after the death of her father Peter, King of Castile and León, also known as Peter the Cruel.
Her mother was María de Padilla, whom Peter had secretly married, but was then forced to repudiate; however he kept her as his mistress.
Constance was married, at Roquefort, near Bordeaux, Guienne, on 21 September 1371, to John of Gaunt, 1st Duke of Lancaster, who was the third son of Edward III of England and Philippa of Hainault, as his second wife.
Constance's younger sister, Infanta Isabella, married Edmund of Langley, 1st Duke of York, the fourth son of King Edward III and Queen Philippa.
On 9 February 1372 Constance made a ceremonial entry into London as Queen of Castile, accompanied by Edward, the Black Prince, and an escort of English and Castilian retainers and London dignitaries.
Crowds lined the streets to see her as she processed to the Savoy Palace in the Strand where she was ceremonially received by her husband, who had proclaimed himself King of Castile and León on 29 January.
This was the way for Gaunt to obtain a kingdom of his own (he had been offered Scotland as a youth by the childless David II but nothing came of this), as his nephew Richard II and the descendants of his brother Lionel of Antwerp, 1st Duke of Clarence, stood between him and the Crown of England.
John of Gaunt claimed the title of King of Castile "jure uxoris", and insisted that English nobles address him as "my lord of Spain", but was unsuccessful in his attempts to obtain the crown.
Their daughter Catherine of Lancaster was married to the king of the Trastámara line, Henry III of Castile, thus uniting these two rival claims.
Constance died at Leicester Castle and was buried at the Church of the Annunciation of Our Lady of the Newarke, Leicester.
Isabella of Castile, Duchess of York
Isabella of Castile, Duchess of York( 1355 – 23 December 1392) was the daughter of King Peter and his mistress María de Padilla( d. 1361).
She accompanied her elder sister, Constance, to England after Constance's marriage to John of Gaunt, 1st Duke of Lancaster, and married Gaunt's younger brother, Edmund of Langley, 1st Duke of York.
Catherine of Lancaster
Catherine of Lancaster (Castilian: "Catalina"; 31 March 1373 – 2 June 1418) was Queen of Castile by marriage to King Henry III of Castile.
She governed Castile as regent from 1406 until 1418 during the minority of her son.
Queen Catherine was the daughter of John of Gaunt, 1st Duke of Lancaster, and his second wife, Constance of Castile (the daughter and heir of King Peter of Castile, who died at the hands of his half brother Henry II).
She was born in Hertford Castle, her father's chief country home, on 31 March 1373.
Catherine became Queen of Castile through her marriage to Henry III.

Question: Where did Constance Of Castile, Duchess Of Lancaster's mother die?
Answer: Seville