Rt Hon Sir Adolphus Frederick Octavius Liddell, Q.C, K.C.B., was made the Permanent Under-Secretary of State for the Home Department by Lord Derby in 1867. He was the eighth son of Sir Thomas Henry Liddell, the sixth baronet of Ravensworth (1775-1855), who was created the first Baron Ravensworth on 17 July 1821, and Maria Susannah, the daughter of John Simpson of Bradley. His elder brothers were Henry Thomas Liddell (1797-1878), the second Baron and first Earl of Ravensworth; Thomas Liddell (b. 1800); John Liddell (1803-65); General George Augustus Liddell (d. 1886), a Groom-in-Waiting to the Queen and Deputy-Ranger of Windsor Great Park; Rev. Robert Liddell (1808-88); Col. George Augustus Frederick Liddell of the Scots Guards (1812-88); and Charles Liddell (1815-32). He also had eight sisters, Maria, Frances Jane, Jane Elizabeth, Elizabeth Charlotte, Susan, Charlotte Amelia and Georgiana, who was maid of honour to Queen Victoria.
In 1845 A. F. O. Liddell married Frederica Elizabeth (d. 1867), the daughter of George Lane-Fox of Bramham Park, Tadcaster. They had two sons, Adolphus George Charles (b. 1846), who became Assistant Secretary in the Lord Chancellor's Department and Chief Clerk in the Crown Office in the Chancery, and Walter Bartram (1857-64). They also had four daughters, Frederica Maria, Gertrude Frances Elizabeth, Mary Beatrice Caroline and Marcia Kathleen Anne.
Debrett, Peerage, Baronetage, Knightage and Companionage, London, 1896; Sir Bernard Burke, A Genealogical and Heraldic History of the Peerage, Baronetage, the Privy Council, Knightage and Companionage, London, 71st ed., 1909; Dictionary of National Biography Online, Oxford, 1997.