question: Who is the paternal grandfather of Robert Bertie, 4Th Duke Of Ancaster And Kesteven?
context: [["Mary Bertie, Duchess of Ancaster and Kesteven", ["Mary Bertie, Duchess of Ancaster and Kesteven( died 19 October 1793), formerly Mary Panton, was the second wife of Peregrine Bertie, 3rd Duke of Ancaster and Kesteven.", "She was the daughter of Thomas Panton of Newmarket( 1697- 1782), who was an equerry to King George II and master of the Thurlow Hunt, and his wife Priscilla( though she may have been illegitimate).", "The duke's first wife, Elizabeth Blundell, died in 1743.", "Mary Panton married the duke on 27 November 1750.", "They had six children:", "Following her marriage to the duke, Mary Panton's father Thomas obtained the post of Master of the King's Running Horses, and his son, also Thomas, later inherited this position.", "In 1757, Sir Joshua Reynolds painted the couple, and another portrait by Reynolds of the duchess was painted between 1765 and 1771.", "A watercolour miniature, by John Smart, dating to 1763, is held by the Nelson- Atkins Museum of Art. From 1761 to 1793, the duchess held the position of Mistress of the Robes to Charlotte of Mecklenburg- Strelitz, Queen Charlotte.", "On the birth of the future King William IV of the United Kingdom, the duchess recommended as wet- nurse a woman called Sarah Tuting, who was later acknowledged as her father's mistress.", "The duchess died in Italy."]], ["Peregrine Bertie, 3rd Duke of Ancaster and Kesteven", ["General Peregrine Bertie, 3rd Duke of Ancaster and Kesteven (171412 August 1778), styled Lord Willoughby de Eresby from 1715 to 1723 and Marquess of Lindsey from 1735 to 1742 was the son of Peregrine Bertie, 2nd Duke of Ancaster and Kesteven.", "He married, firstly, Elizabeth Blundell (died 1743), widow of Charles Gounter Nicoll on 22 May 1735.", "He married, secondly, Mary Panton, on 27 November 1750.", "They had six children:\nOn the death of his father in 1742, he succeeded him in the dukedom and as Lord Great Chamberlain and Lord Lieutenant of Lincolnshire, and was appointed to the Privy Council.", "He gained the rank of Major-General on 19 January 1755, Lieutenant-General on 3 February 1759 and General on 25 May 1772."]], ["Charles Lennox, 4th Duke of Richmond", ["Charles Lennox, 4th Duke of Richmond, 4th Duke of Lennox, 4th Duke of Aubigny,( 9 December 176428 August 1819) was a Scottish peer, soldier, politician, and Governor General of British North America."]], ["Lord Vere Bertie", ["Lord Vere Bertie (c.1712 \u2013 13 September 1768) was a British politician, a younger son of the Duke of Ancaster and Kesteven who represented Boston, Lincolnshire in Parliament from 1741 to 1754.", "Bertie was the third son of Robert Bertie, 1st Duke of Ancaster and Kesteven, and the first son by his second marriage to Albinia Farrington.", "He was educated at Westminster School from 1724 to 1728, and was commissioned an ensign in the 2nd Regiment of Foot Guards in 1729, leaving the Army by 1740.", "Bertie married Anne Casey, the illegitimate daughter of Sir Cecil Wray, 11th Baronet, on 4 October 1736.", "They had two sons and two daughters.", "The sons died young; the two daughters, his heirs, were:", "In the 1741 election, Bertie was returned as Member of Parliament for Boston on his family's interest.", "He voted with the Carteret ministry to support the Hanoverian army in 1742, but defected from them on the same question in January 1744.", "He did not vote in the 1746 division on the Hanoverian subsidies, but after the 1747 election, when he was returned again after a contest, was considered to have gone into opposition to the Pelham ministry.", "Bertie stood down from Parliament in 1754 and died on 13 September 1768."]], ["Robert Bertie, 1st Duke of Ancaster and Kesteven", ["Robert Bertie, 1st Duke of Ancaster and Kesteven PC( 20 October 1660 \u2013 26 July 1723), styled 17th Baron Willoughby de Eresby between 1666 and 1701 and known as 4th Earl of Lindsey between 1701 and 1706 and as 1st Marquess of Lindsey between 1706 and 1715, was a British statesman and nobleman."]], ["Robert Bertie, 4th Duke of Ancaster and Kesteven", ["Robert Bertie, 4th Duke of Ancaster and Kesteven, PC (17 October 1756 \u2013 8 July 1779), styled Lord Robert Bertie until 1758 and Marquess of Lindsey between 1758 and 1778, was a British peer.", "He was born in Grimsthorpe, the second son of the General Peregrine Bertie, 3rd Duke of Ancaster and Kesteven (died 1778) and Mary Panton (died 1793)", "On the death of his elder brother, Peregrine Thomas Bertie, Marquess of Lindsey, on 12 December 1758, he inherited the courtesy title of Marquess of Lindsey.", "He was educated at Eton College and St John's College, Cambridge.", "About 1777, he served as a volunteer in North America.", "A lieutenant in the 7th Regiment of Foot, on 20 January 1778, he was promoted to a captaincy in the 15th Regiment of Foot.", "On his father's death on 12 August 1778, he succeeded as 4th Duke of Ancaster and Kesteven, 4th Marquess of Lindsey, 7th Earl of Lindsey, 20th Baron Willoughby de Eresby and Hereditary Lord Great Chamberlain.", "He was the last to hold the Lord Great Chamberlainship as an undivided office.", "On 12 February 1779 he was invested as Privy Counsellor and was Lord Lieutenant of Lincolnshire.", "He never married and died in Grimsthorpe on 8 July 1779 from scarlet fever.", "He was buried on 22 July 1779 in Edenham.", "On his death, the Hereditary Lord Great Chamberlainship and the Barony Willoughby de Eresby fell into abeyance between his two sisters, all other titles of his passed to his uncle.", "An illegitimate daughter of the 4th duke, Susan, was married to Banastre Tarleton; but there were no children."]], ["Georgiana Cholmondeley, Marchioness of Cholmondeley", ["Georgiana Charlotte Cholmondeley, Marchioness of Cholmondeley( 7 August 1764 \u2013 23 June 1838), formerly Lady Georgiana Charlotte Bertie, was the wife of George Cholmondeley, 1st Marquess of Cholmondeley.", "She was the daughter of Peregrine Bertie, 3rd Duke of Ancaster and Kesteven, and his second wife Mary.", "She married the marquess, then still an earl, on 25 April 1791 in London.", "They had three children:", "The earl already had an illegitimate daughter, Harriet, born around 1790 to his mistress, Madame Saint- Albin.", "Also living in the household was Georgiana Seymour, an illegitimate daughter of an earlier mistress, Grace Dalrymple; Georgiana's father was probably the Prince of Wales.", "Through the marriage between the earl and Georgina Bertie, the ancient hereditary office of Lord Great Chamberlain( which had been held by her brother, Robert Bertie, 4th Duke of Ancaster and Kesteven, until his death in 1779) passed into the Cholmondeley family.", "Georgina's son George Cholmondeley, 2nd Marquess of Cholmondeley, shared the position.", "In 1795, the marchioness( then still a countess) was appointed a Lady of the Bedchamber to the Princess of Wales.", "Their family home was Cholmondeley Castle in Cheshire, which was rebuilt in 1801- 04 according to the earl's own design.", "In 1815 he was created Marquess of Cholmondeley, making his wife a marchioness.", "Lord Cholmondeley, who was fifteen years his wife's senior, died in 1827, and was succeeded by his eldest son George.", "The dowager marchioness died at Carlton House Terrace in London, aged 73."]], ["Priscilla Bertie, 21st Baroness Willoughby de Eresby", ["Priscilla Barbara Elizabeth Bertie, 21st Baroness Willoughby de Eresby( 16 February", "1761 \u2013 29 December 1828) was a daughter of the 3rd Duke of Ancaster and Kesteven and Mary Panton.", "On 23 February 1779, she married Sir Peter Burrell( later 1st Baron Gwydyr) and they later had two children.", "Through her grandmother Mary Wynn, Priscilla Bertie was a descendant of the Welsh princely house of Aberffraw.", "On 8 July 1779, her brother, the 4th Duke of Ancaster and Kesteven, died of scarlet fever at the age of 22 and his dukedom passed to his uncle, but his barony of Willoughby de Eresby, as well as the office of Lord Great Chamberlain, went into abeyance between Priscilla and her sister Georgiana Charlotte, the Countess of Cholmondeley.", "On 17 March 1780, however, the abeyance of the barony was terminated in Priscilla's favour, as the elder sister.", "The office of Lord Great Chamberlain remains divided."]], ["Albemarle Bertie (MP)", ["Albemarle Bertie( c. 1668\u20131742), of Swinstead, Lincolnshire, was an English Whig politician who sat in the English and British House of Commons between 1705 and 1741.", "Bertie was the fifth son of Robert Bertie, 3rd Earl of Lindsey and his wife Elizabeth Wharton.", "Bertie successfully contested Lincolnshire for the Whigs at the 1705 English general election.", "At the 1708 British general election, he stood down at Lincolnshire to make way for his nephew, Lord Willoughby de Eresby and was returned instead for Cockermouth on the interest of his uncle, the 1st Earl of Wharton.", "He was probably the candidate put up by the Wharton interest at Appleby at the 1710 British general election, who withdrew before the poll expressing a desire to sit no longer in Parliament.", "Bertie stood for Lincolnshire again at a by-election in 1721, but was defeated.", "At the 1734 British general election, he was returned for Boston by his nephew, now the 2nd Duke of Ancaster and Kesteven, but stood down again at the 1741 British general election and died the following year."]], ["Peregrine Bertie, 2nd Duke of Ancaster and Kesteven", ["Peregrine Bertie, 2nd Duke of Ancaster and Kesteven( 29 April 16861 January 1742), styled The Honourable Peregrine Bertie between 1686 and 1704, Lord Willoughby de Eresby between 1704 and 1715 and Marquess of Lindsey between 1715 and 1723, was a British politician who sat in the House of Commons from 1708 until 1715 when he was called to the House of Lords."]]]
supporting_facts: [["Robert Bertie, 4th Duke of Ancaster and Kesteven", 1], ["Peregrine Bertie, 3rd Duke of Ancaster and Kesteven", 0]]
evidences: [["Robert Bertie, 4th Duke of Ancaster and Kesteven", "father", "Peregrine Bertie, 3rd Duke of Ancaster and Kesteven"], ["Peregrine Bertie, 3rd Duke of Ancaster and Kesteven", "father", "Peregrine Bertie, 2nd Duke of Ancaster and Kesteven"]]
answer: Peregrine Bertie, 2nd Duke of Ancaster and Kesteven