Knightley was born in Teddington, Middlesex England, the daughter of Sharman Macdonald, an award-winning playwright, and Will Knightley, a theatre and television actor. Her father is English and her mother is Scottish and of half Welsh ancestry. She has an elder brother, Caleb, who was born in 1979. Knightley lived most of her life in Richmond, attending Teddington School and Esher College. Knightley has dyslexia, but nevertheless was successful in school and was thus permitted to acquire a talent agent and pursue an acting career. She requested for an agent as early as the age of three but got one when she turned six, from her mother as a reward for studying hard. Knightley has noted that she was "single-minded about acting" during her childhood. She performed in a number of local amateur productions including After Juliet (written by her mother) and United States (written by her then drama teacher, Ian McShane, no relation to the Deadwood actor).