| The Earl Manvers | |
| Constituency Mp: | South Nottinghamshire |
| Parliament: | Great Britain |
| Term Start: | 1852 |
| Term End: | 1860 |
| Birth Date: | 12 April 1826 |
| Spouse: | Georgine Jane Elizabeth Fanny de Franquetot |
| Allegiance: | Great Britain |
| Branch: | British Army |
| Serviceyears: | 1851–1900 |
| Rank: | Honorary Colonel |
| Unit: | South Nottinghamshire Yeomanry Cavalry |
Sydney William Herbert Pierrepont, 3rd Earl Manvers (12 March 1826 – 16 January 1900) was a British hereditary peer and politician.
Born at Holme Pierrepont in 1826, Pierrepont was the second but only surviving son of Charles Pierrepont, 2nd Earl Manvers and his wife Mary Letitia Eyre. He was educated at Eton, entered Christ Church, Oxford in 1843 and received his BA in 1846.
Pierrepont was styled Viscount Newark after the death of his elder brother in 1850.
While at Oxford, Pierrepont was commissioned a first lieutenant in the Nottinghamshire Yeomanry Cavalry (Sherwood Rangers) in 1844.[1] [2]
In 1851, he was commissioned a captain in the South Nottinghamshire Yeomanry Cavalry. He was appointed lieutenant-colonel commandant of his Yeomanry regiment in 1868, and honorary colonel of the regiment in 1879.
In 1852, Pierrepont was elected unopposed as Conservative Member of Parliament for South Nottinghamshire. He continued to sit for South Nottinghamshire until 1860 when he succeeded to the earldom upon his father's death. He was named a Deputy Lieutenant (DL) of Nottinghamshire in 1854.
Pierrepont married Georgine Jane Elizabeth Fanny de Franquetot, second daughter of Augustin-Gustave de Franquetot, 3rd Duke of Coigny in 1852. They had five children:Pine, L. G.. The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms. London, U.K.: Heraldry Today, 1972, page 190
Lord Manvers died in January 1900 at the age of 73 at Thoresby Hall from bronchitis after having influenza.[3] He was succeeded in the earldom by his eldest son, Charles.