Robin Fox (theatrical agent)
Robin Fox MC( 15 July 1913 – 20 January 1971) was an English actor, theatrical agent, and chairman of the English Stage Company, best remembered as the founder of a family of actors.
His sons are James, Edward, and Robert Fox.
His grandchildren include Emilia, Laurence, Jack, Freddie, and Lydia Fox.
Richard Temple-Nugent-Brydges-Chandos-Grenville, 1st Duke of Buckingham and Chandos
Richard Temple- Nugent- Brydges- Chandos- Grenville, 1st Duke of Buckingham and Chandos( 20 March 1776 – 17 January 1839), styled Earl Temple from 1784 to 1813 and known as The Marquess of Buckingham from 1813 to 1822, was a British landowner and politician.
Catherine Sheffield, Duchess of Buckingham and Normanby
Catherine Sheffield, Duchess of Buckingham and Normanby( c. 1681 – 13 March 1743), formerly Lady Catherine Darnley, was an illegitimate daughter of King James II of England, and was married to two English noblemen in succession.
Lady Catherine was the king's daughter by his mistress Catherine Sedley, Countess of Dorchester, and was given the surname Darnley with reference to her father's ancestor, Lord Darnley.
There was some doubt about her paternity, as Catherine Sedley was thought to have other lovers.
By royal warrant, Lady Catherine Darnley was given the status of a duke's daughter in the order of precedence.
Lady Catherine's first husband was James Annesley, 3rd Earl of Anglesey, whom she married on 28 October 1699 at Westminster Abbey.
The couple were separated in 1701 by Act of Parliament, on the grounds of the earl's cruelty, with the countess claiming that he had tried to murder her.
She left him while he was defending himself from her claim in the House of Lords.
The earl contracted tuberculosis and died early in 1702.
They had one daughter, Lady Catherine Annesley( c.1700-1736), who married, first, William Phipps, and second, John Sheldon( or Skelton).
On 16 March 1706 the widowed countess married, as his third wife, John Sheffield, 1st Duke of Buckingham and Normanby; the wedding took place at St Martin- in- the- Fields.
The duke, a great supporter of King James, was more than thirty years older than his new duchess, and they had three children, two of whom died in infancy:
The duke's previous marriages were said to have been unhappy, but he doted on Catherine, with their friend Alexander Pope claiming that" whenever they have had any difference ... he could never stay till suppertime ... nor till she returned back of herself into his room, but constantly left his books or business to come after her, and said," Child, you and I should never fall out; and though I still think myself in the right, yet you shall have it in your way."
When the duke died in 1721, she called on Pope and Francis Atterbury to produce a memorial edition of his poems and other works.
Since all of Catherine's children pre-deceased her, the dukedom became extinct and her late husband's titles and estates passed to his illegitimate son, Sir Charles Herbert Sheffield, 1st Baronet.
The descendants of her daughter, Lady Catherine Annesley, included Constantine Phipps, 1st Baron Mulgrave, Henry Phipps, 1st Earl of Mulgrave, the Hon. Charles Phipps, MP and General the Hon. Edmund Phipps.
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.
Edmund Sheffield, 2nd Earl of Mulgrave
Edmund Sheffield, 2nd Earl of Mulgrave( December 161124 August 1658) was an English peer who supported the Parliamentary cause during the English Civil War period.
His father was Sir John Sheffield( drowned in 1614), heir to Lord Sheffield, and his mother was Grizel Anderson, daughter of Sir Edmund Anderson, chief justice of common pleas.
As grandson of the First Earl, Mulgrave succeeded to his title in October 1646, and also succeeded his grandfather as Vice- Admiral of Yorkshire.
He sat in the House of Lords until its abolition, and was a member of the Council of State during the Commonwealth.
In 1658 he was nominated as a member of Cromwell's Upper House, butlike most of the other peers summoneddeclined to serve.
He died later the same year.
Mulgrave married Elizabeth Cranfield, daughter of the Earl of Middlesex.
Their son, John, who succeeded to the earldom, was later created Marquess of Normanby and Duke of Buckingham and Normanby, and was Lord Privy Seal and Lord President of the Council during the reign of Queen Anne.
Sir Charles Herbert Sheffield, 1st Baronet
Sir Charles Herbert Sheffield, 1st Baronet( c. 1706–1774) of Normanby, Lincolnshire, England, was an illegitimate son of John Sheffield, 1st Duke of Buckingham and Normanby and the first of the Sheffield baronets, and the owner of Buckingham Palace( then known as Buckingham House) who sold it to King George III.
John Sheffield, 1st Duke of Buckingham and Normanby
John Sheffield, 1st Duke of Buckingham and Normanby,( 7 April 164824 February 1721) was an English poet and Tory politician of the late Stuart period who served as Lord Privy Seal and Lord President of the Council.
He was also known by his original title, Lord Mulgrave.
Edmund Sheffield, 2nd Duke of Buckingham and Normanby
Edmund Sheffield, 2nd Duke of Buckingham and Normanby( 11 January 1716 – 30 October 1735) was an English nobleman, styled Marquess of Normanby from 1716 to 1721.
The legitimate son of John Sheffield, 1st Duke of Buckingham and Normanby, he succeeded his father in 1721.
He matriculated at Queen's College, Oxford in 1732 and died of consumption in Rome in 1735.
As he never married and left no issue, the dukedom became extinct upon his death.
The family estates, including Normanby Park, devolved upon his illegitimate half brother Charles Herbert Sheffield.
Humphrey Stafford, Earl of Stafford
Humphrey Stafford( – 1458), generally known by his courtesy title of Earl of Stafford, was the eldest son of Humphrey Stafford, 1st Duke of Buckingham and Lady Anne Neville( d. 1480).
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: Who was born first out of John Sheffield, 1St Duke Of Buckingham And Normanby and Robin Fox (Theatrical Agent)?
Answer: John Sheffield, 1St Duke Of Buckingham And Normanby