Pierrepont was the eldest son of Charles Pierrepont, 1st Earl Manvers, by Anne, daughter of William Mills, of Richmond, Surrey. Charles Pierrepont, 2nd Earl Manvers and Henry Pierrepont were his younger brothers.
Pierrepont was returned to parliament for Bossiney in April 1796, but already the following month he succeeded his father (who had been ennobled as Viscount Newark) as Member of Parliament for Nottinghamshire, a seat he held until his early death five years later.
|Parliament of Great Britain|
James Archibald Stuart
| Member of Parliament for Bossiney
With: James Archibald Stuart
Lord Edward Bentinck
| Member of Parliament for Nottinghamshire
With: Lord William Bentinck
Lord William Bentinck
Hon. Charles Pierrepont
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