Philip Sidney, 5th Earl of Leicester
Philip Sidney, 5th Earl of Leicester( 8 July 1676 – 24 July 1705) was a British peer and Member of Parliament for Kent, styled Viscount Lisle from 1698 to 1702.
He inherited the earldom from Robert Sidney, 4th Earl of Leicester and was succeeded by his brother John Sidney, 6th Earl of Leicester.
There is a memorial to him at St John the Baptist, Penshurst.
Philip Smythe, 2nd Viscount Strangford
Philip Smythe, 2nd Viscount Strangford (23 March 1634 – 8 August 1708) was an English politician who sat in the House of Commons in 1660.
Smythe was the son of Thomas Smythe, 1st Viscount Strangford of Westenhanger and Sturry, Kent and his wife Lady Barbara Sidney, the daughter of Robert Sidney, 1st Earl of Leicester.
He inherited the title on the death of his father in 1635.
In 1659 he was arrested at Canterbury, with his half brother Thomas Colepeper, following the uprising, and was released on parole and bail for £5,000.
In 1660, Smythe was elected Member of Parliament for Hythe in the Convention Parliament.
Smythe died at the age of 74.
Smythe married firstly his cousin Isabella Sidney, daughter of Robert Sidney, 2nd Earl of Leicester.
After her death in 1663, he married Mary, daughter of George Porter.
He was succeeded by his son Endymion.
Robert Sidney, 1st Earl of Leicester
Robert Sidney, 1st Earl of Leicester( 19 November 1563 – 13 July 1626), second son of Sir Henry Sidney, was a statesman of Elizabethan and Jacobean England.
He was also a patron of the arts and an interesting poet.
His mother, Mary Sidney" née" Dudley, was a lady- in- waiting to Queen Elizabeth I and a sister of Robert Dudley, 1st Earl of Leicester, an advisor and favourite of the Queen.
Thomas Coke, 8th Earl of Leicester
Thomas Edward Coke, 8th Earl of Leicester( born 6 July 1965), is the son of Edward Coke, 7th Earl of Leicester, and Valeria Phyllis Potter.
He is the current Earl of Leicester.
From 1994 to 2015, when he succeeded into the Earldom, he was styled Viscount Coke.
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.
Jocelyn Sidney, 7th Earl of Leicester
Jocelyn Sidney, 7th Earl of Leicester( 1682 – 7 July 1743) was a British peer, known as Hon. Jocelyn Sidney until 1737.
He was the son of Robert Sidney, 4th Earl of Leicester and Lady Elizabeth Egerton.
He was educated at University College, Oxford University.
In 1734, he was appointed Chief Porter of the Tower of London by his older brother John Sidney, 6th Earl of Leicester, then Constable of the Tower.
He succeeded his brother in that year, but died without legitimate issue in 1743, when the titles of Earl of Leicester and Viscount Lisle became extinct.
Jocelyn's illegitimate daughter Lady Anne Sidney married Henry Streatfeild of Chiddingstone, Kent on 25 September 1752.
On Sir Jocelyn's death, Henry could potentially have inherited the Penshurst Estate, but after much legal wrangling Henry and Anne only received the income from the Sidneys' Welsh properties- but these were still fairly significant.
Robert Sidney, 4th Earl of Leicester
Robert Sidney, 4th Earl of Leicester (1649 – 11 November 1702) was the son of Philip Sidney, 3rd Earl of Leicester, and the former Lady Catherine Cecil.
Barbara Sidney, Countess of Leicester
Barbara Sidney, Countess of Leicester( 1563 – 24 May 1621) was a Welsh heiress, and the first wife of Robert Sidney, 1st Earl of Leicester.
Philip Sidney, 3rd Earl of Leicester
Philip Sidney, 3rd Earl of Leicester (10 January 1619 – 6 March 1698) was an English politician who sat in the House of Commons at various times between 1640 and 1659 and inherited the peerage of Earl of Leicester in 1677.
He supported the Parliamentary cause in the English Civil War.
During the Wars of the Three Kingdoms, he was known as Viscount Lisle or (Lord Lisle)
a subsidiary title of the Earls of Leicester.
Sidney was the son of Robert Sidney, 2nd Earl of Leicester, and his wife Dorothy Percy, daughter of Henry Percy, 9th Earl of Northumberland.
In April 1640, he was elected Member of Parliament for Yarmouth, Isle of Wight in the Short Parliament.
He was elected MP for both Yarmouth and St Ives for the Long Parliament in November 1640, and chose to sit for Yarmouth.
He was Colonel of a Regiment of Horse in Ireland in 1641.
Lord Lisle supported the Parliamentary cause in the civil war and was Lord Lieutenant and Commander-in-Chief of Ireland from 1646 to 1647.
He survived Pride's Purge in 1648 to sit in the Rump Parliament and was a Councillor of State from 1648 to 1650.
He was appointed a judge for the trial of King Charles I but declined to act.
He was President of the Council from 1651 to 1652.
He was Councillor of State and Councillor to the Lord Protector in 1653.
Also in 1653, he was elected MP for Kent in the Barebones Parliament.
In 1654 he was elected MP for Isle of Wight, a constituency that only existed in the First Protectorate Parliament.
He was appointed to Cromwell's "House of Lords" in 1658 under the designation "Lord Viscount Lisle".
In 1659 he was returned to the House of Commons for the Restored Rump parliament.
On the restoration of King Charles II in 1660 Lord Lisle received a pardon.
In 1677 he inherited the Earldom on the death of his father.
Lord Lisle married Lady Catherine Cecil, daughter of William Cecil, 2nd Earl of Salisbury, and his wife Lady Catherine Howard, in 1645.
Their children were Dorothy and Robert; the latter succeeded to his father's earldom.
Two of Lord Lisle's brothers supported parliament in the Civil War.
Algernon Sydney was a Parliamentarian "martyr", but Henry Sydney, 1st Earl of Romney did not follow the cause to the same treasonous extremes.
Robert Sidney, 2nd Earl of Leicester
Robert Sidney, 2nd Earl of Leicester (1 December 1595 – 2 November 1677) was an English diplomat and politician who sat in the House of Commons between 1614 and 1625 and then succeeded to the peerage as Earl of Leicester.

Question: Who is Robert Sidney, 4Th Earl Of Leicester's paternal grandfather?