Answer
Heath-Sladen was Elisabeth's maiden name. Elizabeth II was born Princess Elizabeth Alexandra Mary on 21 April 1926, to the Duke and Duchess of York (later King George VI and Queen Elizabeth). Her paternal grandparents were King George V and Queen Mary, while her maternal grandparents were Claude Bowes-Lyon, 14th Earl of Strathmore and Kinghorne, and Cecilia Cavendish-Bentinck.