William Pierrepont (c. 1607-1678), English politician, was the second son of Robert Pierrepont, 1st earl of Kingston. Returned to the Long Parliament in 1640 as member for Great Wenlock, 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 favoured 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. 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 Company. Chouteau built (in 1830-1831) the "Yellowstone," which went up the river to the present site of Pierre in 1831, and was the first steamboat to navigate the upper waters of the Missouri. Chouteau lived for some years in New York City, and while living in St Louis was a member of the convention (1820) which drafted the first constitution of Missouri.
moderate views Pierrepont enjoyed the personal friendship of Cromwell; but, 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 pf 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. He represented 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, spending the remainder of his life in retirement, he died in 1678. Pierrepont married Elizabeth, daughter of Sir Thomas Harris, Bart., of Tong Castle, Shropshire, by whom he had five sons and five daughters. His eldest son, Robert (d. 1666), was the father of Robert, 3rd earl, William, 4th earl, and Evelyn, 1st duke of Kingston; and his third son, Gervase (1649-1715), was created in 1714 baron Pierrepont of Hanslope, a title which became extinct on his death.
