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.
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.
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.
Margaret of York (1472)
Margaret of York( 10 April 1472 – 11 December 1472) was a namesake niece of Margaret of York, Duchess of Burgundy.
She was the fifth child and fourth daughter of Edward IV of England and Elizabeth Woodville.
She was a younger sister of Elizabeth of York, Mary of York, Cecily of York and Edward V of England and older sister of Richard of Shrewsbury, 1st Duke of York, Anne of York, George Plantagenet, Duke of Bedford, Catherine of York and Bridget of York.
She was born in Winchester Castle but died of natural causes eight months later.
She was buried in Westminster Abbey.
Margaret's sarcophagus was originally placed to fit in the steps of the shrine of St. Edward the Confessor, but it was moved to the edge of the chapel at the time of the dissolution of the monasteries.
The step edging around the sides can, however, still be seen.
An annotated history of the Abbey in the Abbey's library states that the lid was removed in more modern times and the sarcophagus found to be empty.
The monumental brass originally on the top of Margaret's tomb is long since missing, but the original wording around the edge and on the surface plaque was recorded historically.
Beatriz de Bobadilla
Beatriz de Bobadilla( 1440 – 1511) was a Spanish noble and courtier.
She is known as the confidant of Queen Isabella I of Castile.
She was the childhood friend of Isabella, and remained at her court as her adviser throughout her reign, once being subjected to an assassination attempt when mistaken for the queen.
Edmund of Langley, 1st Duke of York
Edmund of Langley, 1st Duke of York, KG (5 June 13411 August 1402) was the fourth surviving son of King Edward III of England and Philippa of Hainault.
Like many medieval English princes, Edmund gained his nickname from his birthplace: Kings Langley Palace in Hertfordshire.
He was the founder of the House of York, but it was through the marriage of his younger son, Richard of Conisburgh, 3rd Earl of Cambridge, to Anne de Mortimer, great-granddaughter of Edmund's elder brother Lionel of Antwerp, 1st Duke of Clarence, that the House of York made its claim to the English throne in the Wars of the Roses.
The other party in the Wars of the Roses, the incumbent House of Lancaster, was formed from descendants of Edmund's elder brother John of Gaunt, 1st Duke of Lancaster, Edward III's third son.
Richard of Conisburgh, 3rd Earl of Cambridge
Richard of Conisburgh, 3rd Earl of Cambridge( c. July 1385 – 5 August 1415) was the second son of Edmund of Langley, 1st Duke of York, and Isabella of Castile.
He was beheaded for his part in the Southampton Plot, a conspiracy against King Henry V.
He was the father of Richard Plantagenet, 3rd Duke of York, and the grandfather of King Edward IV and King Richard III.
Anne of York, Duchess of Exeter
Anne of York, Duchess of Exeter, aka Anne Plantagenet( 10 August 1439 – 14 January 1476), was the first child of Richard Plantagenet, 3rd Duke of York, and Cecily Neville.
She was thus the eldest sister of kings Edward IV( 1461 – 1483) and Richard III( 1483 – 1485); and of Edmund, Earl of Rutland, Elizabeth of York, Duchess of Suffolk, Margaret, Duchess of Burgundy and of George Plantagenet, 1st Duke of Clarence.
Isabella of France, Dauphine of Viennois
" For other persons named Isabella of France, see Isabella of France( disambiguation)" Isabella of France and Burgundy( 1310 – April 1348) was the daughter of Philip V of France and Joan II, Countess of Burgundy.
Tahira Wasti
Tahira Wasti( 1944 – March 11, 2012) was a well- known Pakistani writer and television actress.
She is best known for portrayal of Isabella of Castile in the TV drama" Shaheen".

Question: Where did Isabella Of Castile, Duchess Of York's husband die?
Answer: Hertfordshire