The diaries of the 4th Duke of Newcastle (Ne 2F 1-8) begin after the death of his daughter, Anna Maria (1808-1822), and his wife, Georgiana (1789-1822), in 1822 and continue until shortly before his death in 1851. The entries are detailed, and concern all aspects of his domestic and public life, including comments on news and reports of contemporary events. Family members are referred to frequently, providing information about his daughters, Charlotte, Georgiana, Caroline (later Ricketts) and Henrietta (later D'Eyncourt), and his sons. He was estranged from his eldest son, Henry, Lord Lincoln, and there are references to both Lord Lincoln and his wife Susan, Lady Lincoln, from whom he was subsequently divorced.
Lord William Pelham-Clinton wrote the journal which records the grand tour of Europe made by himself and his younger twin brothers, Lord Charles and Lord Thomas Pelham Clinton, from 13 July to 24 September 1837. They visited Belgium, Germany, Switzerland, northern Italy and Austria. The diary includes many comments on scenery, buildings, and artistic works (Ne 2F 9). A companion volume written by his brother, Lord Charles, describes the same tour (Ne 2F 11). A diary of another grand tour in Europe undertaken by Lord William Pelham-Clinton in 1839-1840 is also present (Ne 2F 12).
Henry Pelham-Clinton, 5th Duke of Newcastle, recorded his observations during his tour of the Crimea from 27 June-16 October 1855, which he undertook following his resignation as Secretary for War (Ne 2F 10).