Leslie Stephen was born in 1832 in South Kensington to Sir James and Lady Jane Catherine Stephen (née Venn), daughter of John Venn, rector of Clapham. The Venns were the centre of the evangelical Clapham Sect. Sir James Stephen was the under secretary at the Colonial Office, and with another Clapham member, William Wilberforce, was responsible for the passage of the Slavery Abolition Bill in 1833. In 1849 he was appointed Regius Professor of Modern History at Cambridge University. As a family of educators, lawyers and writers the Stephens represented the elite intellectual aristocracy. While his family were distinguished and intellectual, they were less colourful and aristocratic than Julia Jackson's. A graduate and fellow of Cambridge University he renounced his faith and position to move to London where he became a notable man of letters. In addition he was a rambler and mountaineer, described as a "gaunt figure with the ragged red brown beard...a formidable man, with an immensely high forehead, steely-blue eyes, and a long pointed nose". In the same year as Julia Jackson's marriage, he wed Harriet Marian (Minny) Thackeray (1840–1875), youngest daughter of William Makepeace Thackeray, who bore him a daughter, Laura (1870–1945), but died in childbirth in 1875. Laura was developmentally disabled and eventually institutionalised.