The Pierrepont Collection consists of over 600 paintings (in various mediums) by the artist Marie-Louise Roosevelt Pierrepont (1889–1984.) She began her artistic career in 1905, when she trained at the Academie Julian in Paris. When she later married Captain Gervas Pierrepont (6th Earl Manvers), she became Countess Manvers of Thoresby Hall and was devoted to the area of North Nottinghamshire. The collection includes finely-executed portraits, demonstrating attention to detail and academic training. There are heavy oils with detailed interiors of Thoresby Hall during twentieth century, featuring state rooms and Pierrepont's own private rooms. The rest of the collection consists of oil portraits, still life subjects and around 400 watercolour landscapes of Britain, Europe and North Africa. The watercolours are produced en plein air, representing local scenes, as well as a document of her travels from late 1940s, when she employed a female Chauffeuse to accompany her; a time when not many women would have this experience. The local scenes also feature the regiments during World War II when Thoresby Park was requisitioned. Overall, the collection is a social history according to one artist, documenting her life and travels during the twentieth century. Collection development consists of talks, tours, education and volunteers’ projects.