William Pierrepont (c. 1607 –17 July 1678) was an English politician who sat in the House of Commons at various times between 1640 and 1660. He supported the Parliamentary cause in the English Civil War.
Pierrepont was the second son of Robert Pierrepont, 1st Earl of Kingston-upon-Hull and his wife Gertrude Talbot, daughter of Hon. Henry Talbot of Burton Abbey, Yorkshire. [1] He matriculated from Emmanuel College, Cambridge, in 1624 and was admitted at Lincoln's Inn on 1 April 1627. [2] He was appointed Sheriff of Shropshire for 1638. [1]
In April 1640, Pierrepont was elected Member of Parliament for Shropshire in the Short Parliament. He was elected MP for Great Wenlock in the Long Parliament in November 1640. He threw his influence on the side of peace and took part for the parliament in the negotiations with Charles I at Oxford in 1643. Pierrepont was a member of the committee of both kingdoms, and represented the parliamentary party during the deliberations at Uxbridge in 1645; but from that time, according to Clarendon, he forsook his moderate attitude, and contracted more bitterness and sourness than formerly. This statement, however, is perhaps somewhat exaggerated, as Pierrepont favored the resumption of negotiations with the king in 1647, and in the following year his efforts on behalf of peace at Newport, where again he represented the parliamentarians, brought upon him some slight censure from Cromwell. [3]
For his services at Newport, he was thanked by Parliament; but he retired from active political life soon afterwards, as he disliked the purging of the House of Commons by Colonel Pride and the proceedings against the king. In spite of his moderate views Pierrepont enjoyed the personal friendship of Cromwell. [3] He was elected MP for Nottinghamshire in 1654 for the First Protectorate Parliament. [1] Although elected, he would not sit in the parliament of 1656, nor would he take the place offered to him in the Protector's House of Lords. When Richard Cromwell succeeded his father, Pierrepont was an unobtrusive but powerful influence in directing the policy of the government, and after a short period of retirement on Richard's fall he was chosen, early in 1660, a member of the council of state but refused to take his seat when secluded members were readmitted to the Restored Rump. He was elected MP for Nottinghamshire in the Convention Parliament of 1660, and probably was instrumental in saving the lives of some of the parliamentary leaders. At the general election of 1661, he was defeated and spent the remainder of his life in retirement. He died in 1678. [3] [1]
Pierrepont married Elizabeth, daughter of Sir Thomas Harries, Bart., of Tong Castle, Shropshire, by whom he had five sons and five daughters:
Evelyn Pierrepont, 1st Duke of Kingston-upon-Hull, was an English aristocrat.
Charles Howard, 1st Earl of Carlisle was an English military leader and politician who sat in the House of Commons at various times between 1653 and 1660 and was created Earl of Carlisle in 1661.
Duke of Kingston-upon-Hull was a title in the Peerage of Great Britain, with the title Earl of Kingston-upon-Hull being a title in the Peerage of England. The earldom was created on 25 July 1628 for Robert Pierrepont, 1st Viscount Newark. The dukedom was created on 10 August 1715 for his great-grandson, Evelyn Pierrepont, 1st Marquess of Dorchester, who had succeeded as the fifth Earl of Kingston-upon-Hull in 1690. The dukedom became extinct on the death of the second Duke in 1773. Unlike the city to which they refer, Kingston upon Hull, which is usually shortened to Hull, these titles are usually shortened to Duke of Kingston.. They should not be confused with the separate Irish Earldom of Kingston.
Pierrepont is the name or part of the name of several communes in northern France:

Robert Pierrepont, 1st Earl of Kingston-upon-Hull was an English nobleman who joined the Royalist side in the English Civil War after some delay and became lieutenant-general of the counties of Lincoln, Rutland, Huntingdon, Cambridge and Norfolk. He was killed in a friendly fire incident after being captured by Parliamentary forces.
Henry Pierrepont, 1st Marquess of Dorchester, PC, FRS, FRCP was an English peer. He was the son of Robert Pierrepont, 1st Earl of Kingston-upon-Hull, and his wife, the former Gertrude Talbot, daughter of George Talbot and Elizabeth Reyner, and cousin of the Earl of Shrewsbury.
Sir Oliver St John was an English judge and politician who sat in the House of Commons from 1640-53. He supported the Parliamentary cause in the English Civil War.
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Evelyn Pierrepont, 2nd Duke of Kingston-upon-Hull, KG was an English nobleman and landowner, a member of the House of Lords.
Henry Cavendish, 2nd Duke of Newcastle upon Tyne, KG, PC, styled Lord Henry Cavendish until 1659 and Viscount Mansfield from 1659 to 1676, was an English politician. He sat in the House of Commons from 1660 until 1676, when he inherited the dukedom.
This is a list of people who have served as Custos Rotulorum of Nottinghamshire.

Charles (Medows) Pierrepont, 1st Earl Manvers was a British naval officer and politician who sat in the House of Commons from 1778 to 1796 when he was raised to the peerage as Viscount Newark.
Sir John Glynne KS was a Welsh lawyer of the Commonwealth and Restoration periods, who rose to become Lord Chief Justice of the Upper Bench, under Oliver Cromwell. He sat in the House of Commons at various times between 1640 and 1660.
Sir Henry Pierrepont was an English MP who resided at Holme Pierrepont, Nottinghamshire.
Robert Wallop was an English politician who sat in the House of Commons at various times from 1621 to 1660. He supported the Parliamentary cause in the English Civil War and was one of the regicides of King Charles I of England.
Sir Thomas Harries or Harris, 1st Baronet was an English lawyer.
Sir John Evelyn was an English politician who sat in the House of Commons variously between 1626 and 1660.
Francis Pierrepont was an English politician who sat in the House of Commons in 1640. He fought in the Parliamentary army in the English Civil War.
Gervase Pierrepont, 1st Baron Pierrepont, was an English politician.
Gertrude Pierrepont, Countess of Kingston-upon-Hull, born Gertrude Talbot, was an English noblewoman and peeress, the wife of Robert Pierrepont, 1st Earl of Kingston-upon-Hull, and the daughter of the Honourable Henry Talbot, and his wife, the former Elizabeth Reyner.