David Stuart Horner was born on 29 July 1900, the son of John Stuart Horner (b. 1855) and Emily Green, the daughter of Col.
James Francis Birch, of the
3rd West India Regiment. He was a member of the Horner family of
Mells Manor, Somerset. According to Horner himself, "I am directly descended from Little Jack Horner (Henry VIII) who was lampooned in
the nursery rhyme – the 'Plum' being the property of Mells bought by my ancestor when the monks were kicked out of
Glastonbury Abbey – his enemies said that he had stolen the title deeds: Mells, which now belongs to my first cousin Katharine [Horner] Asquith, is once again in the hands of a Catholic." According to Osbert Sitwell, Horner's future companion, "The Horners are probably one of the few Saxon families still extant. [...] I am rather bored with the Normans and consider them nouveaux riches." Horner attended
Eton College and then
Trinity Hall, Cambridge, and obtained a BA degree in History and Modern Languages. According to
Sarah Bradford, Sacheverell Sitwell's biographer, "At Cambridge, a male admirer addressed Horner as 'Beauteous Adonis': he was pale, willowy and elegant, with a finely drawn profile and blond." ==Career==