William Montagu Douglas Scott, 6th Duke of Buccleuch
William Henry Walter Montagu Douglas Scott, 6th Duke of Buccleuch and 8th Duke of Queensberry( 9 September 1831 – 5 November 1914) was a Scottish Member of Parliament and peer.
He was the paternal grandfather of Princess Alice, Duchess of Gloucester, and the maternal great- grandfather of Prince William of Gloucester and Prince Richard, Duke of Gloucester.
He was a paternal great- great- grandfather to Sarah, Duchess of York.
Philippa of Hainault
Philippa of Hainault (Middle French: "Philippe de Hainaut"; 24 June c.1310/15 – 15 August 1369) was Queen of England as the wife of King Edward III.
Edward promised in 1326 to marry her within the following two years.
She was married to Edward, first by proxy, when Edward dispatched the Bishop of Coventry "to marry her in his name" in Valenciennes (second city in importance of the county of Hainaut) in October 1327.
The marriage was celebrated formally in York Minster on 24 January 1328, some months after Edward's accession to the throne of England.
In August 1328, he also fixed his wife's dower.
Philippa acted as regent in 1346, when her husband was away from his kingdom, and she often accompanied him on his expeditions to Scotland, France, and Flanders.
Philippa won much popularity with the English people for her kindness and compassion, which were demonstrated in 1347 when she successfully persuaded King Edward to spare the lives of the Burghers of Calais.
This popularity helped maintain peace in England throughout Edward's long reign.
The eldest of her thirteen children was Edward, the Black Prince, who became a renowned military leader.
Philippa died at the age of fifty-six from an illness closely related to edema.
The Queen's College, Oxford was founded in her honour.
Nicholas Colfox
Sir Nicholas Colfox( flourished 1400) was a medieval English knight who in 1397 was involved in the murder of Thomas of Woodstock, 1st Duke of Gloucester, uncle of King Richard II, apparently on the orders of the king.
Colfox's involvement in the killing may have been alluded to in Geoffrey Chaucer's" Nun's Priest's Tale", in which a duplicitous fox is referred to as a" Colfox" and described as" liking to murder men".
John Holland, 1st Duke of Exeter
John Holland, 1st Duke of Exeter, 1st Earl of Huntingdon( c. 1352 – 16 January 1400), KG, of Dartington Hall in Devon, was a half- brother of King Richard II( 1377 – 1399), to whom he remained strongly loyal.
He is primarily remembered for being suspected of assisting in the downfall of King Richard's uncle Thomas of Woodstock, 1st Duke of Gloucester( 1355 – 1397)( youngest son of King Edward III) and then for conspiring against King Richard's first cousin and eventual deposer, Henry Bolingbroke, later King Henry IV( 1399 – 1413).
Charles Lennox, 1st Duke of Richmond
Charles Lennox, 1st Duke of Richmond, 1st Duke of Lennox, 1st Duke of Aubigny( 29 July 167227 May 1723), of Goodwood House near Chichester in Sussex, was an illegitimate son of King Charles II by his mistress Louise de Kérouaille, Duchess of Portsmouth.
Thomas of Brotherton, 1st Earl of Norfolk
Thomas of Brotherton, 1st Earl of Norfolk( 1 June 13004 August 1338), was the fifth son of King Edward I of England( 1272 – 1307), and the eldest child by his second wife, Margaret of France, the daughter of King Philip III of France.
He was, therefore, a younger half- brother of King Edward II( 1307 – 1327) and a full brother of Edmund of Woodstock, 1st Earl of Kent.
He occupied the office of Earl Marshal of England.
Thomas of Woodstock, 1st Duke of Gloucester
Thomas of Woodstock, 1st Duke of Gloucester (7 January 13558 or 9 September 1397) was the fifth surviving son and youngest child of King Edward III of England and Philippa of Hainault.
Princess Alice, Duchess of Gloucester
Princess Alice, Duchess of Gloucester,( born Alice Christabel Montagu Douglas Scott; 25 December 1901 – 29 October 2004) was the wife of Prince Henry, Duke of Gloucester, the third son of King George V and Queen Mary.
She was the mother of Prince William of Gloucester and Prince Richard, Duke of Gloucester.
The daughter of the 7th Duke of Buccleuch, Scotland's largest landowner, she became by marriage a princess of the United Kingdom, and a sister- in- law to Edward VIII and George VI.
She was thus an aunt by marriage to Elizabeth II.
Princess Alice was extremely well travelled, both before and after her marriage.
Anne of Gloucester
Anne of Gloucester, Countess of Stafford (30 April 1383 – 16 October 1438) was the eldest daughter of Thomas of Woodstock, Duke of Gloucester, and Eleanor de Bohun.
James FitzJames, 1st Duke of Berwick
James FitzJames, 1st Duke of Berwick, 1st Duke of Liria and Jérica, 1st Duke of Fitz- James( 21 August 1670 – 12 June 1734) was an Anglo- French military leader, illegitimate son of King James II of England by Arabella Churchill, sister of the 1st Duke of Marlborough.
Berwick was a successful general in the pay of Louis XIV of France.

Question: What is the cause of death of Thomas Of Woodstock, 1St Duke Of Gloucester's mother?