Ernest Blackie
Ernest Morell Blackie( 19 August 1867 – 1943) was an Anglican bishop in the 20th century.
Blackie was born in Leamington Spa and educated at Cheltenham Grammar School and the University of London.
Ordained in 1891, he was a curate at St Mark's Gloucester and then a minor canon at Rochester Cathedral until 1900.
He later became the rector of Limpsfield and then St Paul's York Place, Edinburgh before becoming the vicar of Windsor and an Honorary Chaplain to the King.
From 1921 to 1937 he was a residentiary canon at Lincoln Cathedral and for seven years a suffragan bishop in the Diocese of Lincoln( five as Suffragan Bishop of Grantham and two as Bishop of Grimsby) before his final appointment as Dean of Rochester, a position he held until his death in 1943.
In 1903 Blackie married Caroline Stewart, daughter of James Haldane Stewart Jr. and Emily Leveson- Gower of Titsey Place.
Her father was the son of James Haldane Stewart senior( the 19th century ecumenical prelate) and Mary Dale, daughter of David Dale.
Emily Leveson- Gower was a member of one of Britain's most aristocratic families and was a descendant of Thomas Howard, 4th Duke of Norfolk, Edmund Beaufort, 4th Duke of Somerset, Edward Seymour, 1st Duke of Somerset, Charles Brandon, 1st Duke of Suffolk, Henry Cavendish, 2nd Duke of Newcastle- upon- Tyne, Clarence, Thomas Tufton, 6th Earl of Thanet, George Plantagenet, 1st Duke of Clarence, Richard Neville, 16th Earl of Warwick or Warwick the Kingmaker William Russell, 1st Duke of Bedford and John Manners, 1st Duke of Rutland, William Cecil, 1st Baron Burghley, Thomas Cromwell, 1st Earl of Essex as well as Henry VII of England and James V of Scotland.
Antigone of Gloucester, Countess of Tankerville
Antigone of Gloucester was an English noblewoman and the illegitimate daughter of Humphrey of Lancaster, 1st Duke of Gloucester( 1390 – 1447).
She was the granddaughter of King Henry IV.
She is thought to have been born between 1425 and 1428.
Her date of death is not known, but it was later than 1450.
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.
Thomas of Lancaster, 1st Duke of Clarence
Thomas of Lancaster, 1st Duke of Clarence (autumn 1387 – 22 March 1421) was a medieval English prince and soldier, the second son of King Henry IV of England, brother of Henry V, and heir to the throne in the event of his brother's death.
He acted as councillor and aide to both.
After the death of his father, he participated in the military campaigns of his brother in France during the Hundred Years' War.
Left in charge of English forces in France when Henry returned temporarily to England after his marriage to Catherine of Valois, Thomas led the English in their disastrous defeat at the hands of a mainly Scottish force that came to the aid of the French at the Battle of Baugé.
In a rash attack, he and his leading knights were surrounded, and Thomas was killed.
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.
Richard Wesley, 1st Baron Mornington
Richard Colley Wesley, 1st Baron Mornington (– 31 January 1758) was an Irish peer, best remembered as the grandfather of Arthur Wellesley, 1st Duke of Wellington.
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.
Alexander Buchanan (soldier)
Sir Alexander Buchanan( d. 1424) was the eldest of the three sons of Sir Walter Buchanan, eleventh Laird of Buchanan.
He is noted for killing Thomas of Lancaster, Duke of Clarence, heir to the English throne, at the Battle of Baugé.
Henry IV of England
Henry IV (15 April 1367 – 20 March 1413), also known as Henry Bolingbroke , was King of England from 1399 to 1413.
He asserted the claim of his grandfather King Edward III, a maternal grandson of Philip IV of France, to the Kingdom of France.
Henry was the son of John of Gaunt (the fourth son of Edward III) and Blanche of Lancaster.
John enjoyed a position of considerable influence during much of the reign of his nephew King Richard II, whom Henry eventually deposed.
Henry founded the Lancaster branch of the House of Plantagenet.
He was the first King of England since the Norman Conquest whose mother tongue was English rather than French.
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.

Question: Who is the paternal grandfather of Thomas Of Lancaster, 1St Duke Of Clarence?
Answer: John of Gaunt