Question: Who is the paternal grandfather of Jacob Pleydell-Bouverie, 4Th Earl Of Radnor?

Jacob Pleydell-Bouverie, 4th Earl of Radnor
Jacob Pleydell-Bouverie, 4th Earl of Radnor (18 September 1815 – 11 March 1889), was the son of William Pleydell-Bouverie, 3rd Earl of Radnor and Judith
Anne St John-Mildmay.
He was styled Viscount Folkestone from 1828 until 1869.
Folkestone was educated at Harrow and Christ Church, Oxford.
On 2 October 1837, he was commissioned a cornet in the Salisbury Troop of the Royal Wiltshire Regiment of Yeomanry.
He was a lieutenant in the Regiment from 20 May 1840 to April 1847.
He married Lady Mary Augusta Frederica Grimston, daughter of James Walter Grimston, 1st Earl of Verulam, on 3 October 1840.
They had twelve children:
Folkestone was appointed High Sheriff of Wiltshire in 1846 and a deputy lieutenant of Berkshire on 2 May 1855.
He succeeded his father as Earl of Radnor in 1869 and was appointed Lord Lieutenant of Wiltshire in 1878.
Radnor served as Governor of the French Hospital.
Successive Earls of Radnor were governors of the hospital from the eighteenth century to 2015.
Duncombe Pleydell-Bouverie
Admiral The Honourable Duncombe Pleydell- Bouverie( 28 June 1780 – 5 November 1850), was a British naval commander and Whig politician.
Pleydell- Bouverie was the second son of Jacob Pleydell- Bouverie, 2nd Earl of Radnor, and the Honourable Anne Duncombe, daughter of Anthony Duncombe, 1st Baron Feversham.
William Pleydell- Bouverie, 3rd Earl of Radnor, was his elder brother.
Pleydell- Bouverie served in the Royal Navy.
Lieutenant Pleydell- Bouverie was promoted to Commander on 14 February 1801, but did not take command of HMS" Penguin" until 28 August.
Bouverie was promoted to post captain in on 2 April 1802.
Eventually he became an Admiral.
He also sat as Member of Parliament for Downton between 1806 and 1807 and for Salisbury between 1828 and 1832 and again from 1833 to 1835.
He is not recorded as having ever spoken in the House of Commons.
He hoisted his flag in HMS" Victory" as Port Admiral at Portsmouth in 1837.
Pleydell- Bouverie married Louisa, daughter of Joseph May, in 1809.
He died in November 1850, aged 70.
Jacob Pleydell-Bouverie, 8th Earl of Radnor
Jacob Pleydell- Bouverie, 8th Earl of Radnor( 10 November 1927 – 10 August 2008) was a British nobleman.
He was the son of William Pleydell- Bouverie, 7th Earl of Radnor and Helena Olivia Adeane.
He married, firstly, Anne Garden Seth- Smith, daughter of Donald Farquaharson Seth- Smith, on 8 July 1953 and they were divorced in 1962.
He and Anne had two sons:
He married, secondly, Margaret Robin Fleming, daughter of Robin Fleming, in 1963 and they were divorced in 1985.
They had four daughters:
He married, thirdly, Mary Jillean Gwenellan Eddy, daughter of William Edward Montague Eddy, in 1986.
He died at Longford Castle in 2008.
From 1971 to 2008 he served as Governor of the French Hospital in Rochester, Kent.
Successive Earls of Radnor were governors of the hospital from the eighteenth century to 2015.
William Pleydell-Bouverie, 9th Earl of Radnor
William Pleydell- Bouverie, 9th Earl of Radnor( born 5 January 1955), of Longford Castle, Wiltshire, is an English peer and landowner.
The son of Jacob Pleydell- Bouverie, 8th Earl of Radnor, by his marriage to Anne Garden Seth- Smith, daughter of Donald Farquharson Seth- Smith, whose great grandfather was Seth Smith( property developer) who built large proportions of Mayfair and Belgravia in the early 1800s.
Pleydell- Bouverie was educated at Harrow and the Royal Agricultural College, Cirencester.
Until the death of his father, he was known by the courtesy title of Viscount Folkestone.
In 1996 he married Melissa Stanford, daughter of J. K. E. Stanford, formerly Director- General of the Leonard Cheshire Foundation, and a granddaughter of the author J. K. Stanford.
They have four sons and two daughters: Lady Hope( born 1997); Jacob, Viscount Folkestone( born 1999); Luke( born 2000); Dan( born 2002); Edward( born 2004); and a daughter born in 2007.
The heir apparent is their eldest son, Jacob Pleydell- Bouverie, Viscount Folkestone.
William Pleydell-Bouverie, 3rd Earl of Radnor
William Pleydell-Bouverie, 3rd Earl of Radnor (11 May 1779 – 9 April 1869), styled Viscount Folkestone until 1828, was the son of Jacob Pleydell-Bouverie, 2nd Earl of Radnor and Hon.
Anne Duncombe.
He first entered the House of Commons for Downton upon reaching his majority in 1801, switching to Salisbury in 1802.
He was appointed a deputy lieutenant of Berkshire on 22 November 1801.
He married, firstly, Lady Catherine Pelham-Clinton (d. 17 May 1804), daughter of Henry Pelham-Clinton, Earl of Lincoln, on 2 October 1801 and had two children:
On 31 March 1803, he was commissioned a captain in the Berkshire Regiment of Militia, and a captain in the Berkshire Yeomanry on 14 March 1805.
From 9 December 1812 to August 1817, he was lieutenant-colonel of the Berkshire Regiment of Militia.
He married, secondly,
Judith Anne St John-Mildmay, daughter of Sir Henry St John-Mildmay, 3rd Baronet on 24 May 1814 and had six children:
On 27 January 1828, he succeeded his father as Earl of Radnor, and on 9 February 1828 as Recorder of Salisbury.
Radnor was made a deputy lieutenant of Wiltshire on 9 August 1839 and a vice-lieutenant of the county on 17 August 1839.
In 1828, he built a toll road providing an easy route between Folkestone harbour and Sandgate.
The original toll house remains within the Lower Leas Coastal Park.
Either side of the toll road, land was cultivated and grazed.
Old field boundaries are still used in the park, and the 'Cow Path' is a reminder of the drove route from The Leas.
Radnor served as governor of the French Hospital at the time of its move from Finsbury to the new and imposing hospital building in Victoria Park, Hackney, designed by Robert Lewis Roumieu.
Successive Earls of Radnor were governors of the hospital from the eighteenth century to 2015.
Gerald Barry (British Army officer)
Gerald Barry MC (18 December 1896 – 21 February 1977) was a career officer in the British Army who played in one first-class cricket match for the Combined Services against Essex.
In the match, played at Leyton in May 1922, Barry batted at No 10 in the Services team's two innings and scored only two runs, and opened the bowling in each Essex innings without taking a wicket.
He did not play first-class cricket again.
Barry was educated at Eton College, from which he joined the Coldstream Guards in the First World War.
He was awarded the Military Cross.
He later rose to the tank of lieutenant colonel in the Black Watch.
During the Second World War, his postings included deputy military secretary of the Eastern Army in India.
Barry married Lady Margaret Pleydell-Bouverie, daughter of Jacob Pleydell-Bouverie, 6th Earl of Radnor in 1923.
They had five daughters and one son.
His brother-in-law was Nigel Capel-Cure, who also played one first-class cricket match.
William Pleydell-Bouverie, 7th Earl of Radnor
William Pleydell- Bouverie, 7th Earl of Radnor( 18 December 1895 – 23 November 1968), was a British peer.
Radnor was the son of Jacob Pleydell- Bouverie, 6th Earl of Radnor and Julian Eleanor Adelaide Balfour.
He married, firstly, Helena Olivia Adeane, daughter of Charles Robert Whorwood Adeane and Madeline Pamela Constance Blanche Wyndham, on 11 October 1922 and had six children.
He and Helena were divorced in 1942.
He married, secondly, Anne Isobel Graham Oakley, daughter of Lieutenant- Colonel Richard Oakley, on 9 October 1943 and had one child.
Radnor served as Governor of the French Hospital.
Successive Earls of Radnor were governors of the hospital from the eighteenth century to 2015.
Jacob Pleydell-Bouverie, 2nd Earl of Radnor
Jacob Pleydell- Bouverie, 2nd Earl of Radnor FRS FSA( 4 March 1750 – 27 January 1828), styled Hon. Jacob Pleydell- Bouverie from 1761 to 1765 and Viscount Folkestone from 1765 to 1776, was a British politician who sat in the House of Commons from 1771 to 1776 when he succeeded to the peerage as Earl of Radnor.
Ralph Neville, 3rd Earl of Westmorland
Ralph Neville, 3rd Earl of Westmorland( c. 1456 – 6 February 1499) was an English peer.
He was the grandfather of Ralph Neville, 4th Earl of Westmorland.
Jacob Pleydell-Bouverie, 6th Earl of Radnor
Jacob Pleydell- Bouverie, 6th Earl of Radnor,( 8 July 1868 – 26 June 1930), styled Viscount Folkestone from 1889 to 1900, was a British Conservative Party politician and a British Army officer.

Answer: Jacob Pleydell-Bouverie, 2nd Earl of Radnor