Elizabeth Cavendish, Duchess of Devonshire
Elizabeth Christiana Cavendish, Duchess of Devonshire( 13 May 1758 – 30 March 1824) was an English novelist and aristocrat.
She is best known as Lady Elizabeth Foster, the close friend of Georgiana Cavendish, Duchess of Devonshire.
Elizabeth supplanted the Duchess, gaining the affections of William Cavendish, 5th Duke of Devonshire, and later marrying him.
William Cavendish, 5th Duke of Devonshire
William Cavendish, 5th Duke of Devonshire, (14 December 1748 – 29 July 1811), was a British nobleman, aristocrat, and politician.
He was the eldest son of William Cavendish, 4th Duke of Devonshire, by his wife, the heiress Lady Charlotte Boyle, "suo jure" Baroness Clifford, who brought in considerable money and estates to the Cavendish family.
He was invited to join the Cabinet on three occasions, but declined each offer.
He was Lord High Treasurer of Ireland and Governor of Cork, and Lord Lieutenant of Derbyshire.
The 5th Duke is best known for his first wife Georgiana, Duchess of Devonshire.
At the age of about twenty, Devonshire toured Italy with William Fitzherbert which is where they commissioned the pair of portraits by Pompeo Batoni.
Blanche Cavendish, Countess of Burlington
Blanche Cavendish, Countess of Burlington(" née" Howard; 11 January 1812 – 27 April 1840) was the wife of William Cavendish, 2nd Earl of Burlington, who would later become the 7th Duke of Devonshire.
William Cavendish, 1st Duke of Devonshire
William Cavendish, 1st Duke of Devonshire( 25 January 164018 August 1707) was an English soldier, nobleman, and Whig politician who sat in the House of Commons from 1661 to 1684 when he inherited his father's peerage as Earl of Devonshire.
He was part of the" Immortal Seven" group that invited William III, Prince of Orange to depose James II of England as monarch during the Glorious Revolution, and was rewarded with the elevation to Duke of Devonshire in 1694.
Georgiana Cavendish, Duchess of Devonshire
Georgiana Cavendish, Duchess of Devonshire(" née" Spencer;; 7 June 1757 – 30 March 1806), was an English socialite, political organizer, style icon, author, and activist.
Of noble birth from the Spencer family, married into the Cavendish family, she was the first wife of William Cavendish, 5th Duke of Devonshire, and the mother of the 6th Duke of Devonshire.
As the Duchess of Devonshire, she garnered much attention and fame in society during her lifetime.
With a pre-eminent position in the peerage of England, the duchess was famous for her charisma, political influence, beauty, unusual marital arrangement, love affairs, socializing, and gambling.
She was the great- great- great- grandaunt of Diana, Princess of Wales.
Their lives, centuries apart, have been compared in tragedy.
William Cavendish, 4th Duke of Devonshire
William Cavendish, 4th Duke of Devonshire, (8 May 1720 – 2 October 1764), styled Lord Cavendish before 1729 and Marquess of Hartington between 1729 and 1755, was a British Whig statesman and nobleman who was briefly nominal Prime Minister of Great Britain.
He was the first son of William Cavendish, 3rd Duke of Devonshire and his wife, the former Catherine Hoskins.
Ludovico Caracciolo
Ludovico Caracciolo( 1761 in Rome – 1842) was an Italian landscapist and engraver.
He became a protege of Elizabeth Foster, the second wife of William Cavendish, 5th Duke of Devonshire, who moved to Rome after she was widowed in 1811.
He published a full set of print reproductions after Claude Lorrain's" Liber Veritatis" in Rome in 1815.
His specialism was architectural drawings and panoramas of Rome, including an 1824 oil on canvas that is now in the collection of the Victoria and Albert Museum – he also adapted that work as a six- print aquatint in 1831.
William Cavendish, 2nd Duke of Devonshire
William Cavendish, 2nd Duke of Devonshire( 1672 – 4 June 1729) was a British nobleman and politician.
He was the eldest son of William Cavendish, 1st Duke of Devonshire and Lady Mary Butler.
A prominent Whig, he was sworn of the Privy Council in 1707, and served as Lord President of the Council from 1716 to 1717 and 1725 to 1729.
He married The Hon. Rachel Russell( 1674 – 1725), daughter of William Russell, Lord Russell on 21 June 1688.
They had five children:
Gregorio María de Silva y Mendoza, 9th Duke of the Infantado
Gregorio de Silva y Mendoza( born 1649, Pastrana- d. 1693, Madrid) was a Spanish noble from the House of Mendoza.
He was the 5th Duke of Pastrana 9th Duke of the Infantado, 7th Duke of Lerma, 6th Duke of Francavilla, 5th Duke of Estremera, and the Prince of Eboli and Melito.
Catherine Cavendish, Duchess of Devonshire
Catherine Cavendish, Duchess of Devonshire( 1700 – 8 May 1777), formerly Catherine Hoskins( or Hoskyn), was the wife of William Cavendish, 3rd Duke of Devonshire, and mother of the 4th Duke.

Question: Who is the paternal grandmother of William Cavendish, 5Th Duke Of Devonshire?
Answer: Catherine Hoskins