premise: The mother of Elizabeth I was executed.
hypothesis: Elizabeth Danvers . She was the mother of Sir Charles Danvers , executed in 1601 for his part in the rebellion of Robert Devereux , 2nd Earl of Essex , and of Sir John Danvers , one of the commissioners who tried King Charles I and signed the King 's death warrant . Elizabeth Angela Marguerite Bowes-Lyon ( 4 August 1900 -- 30 March 2002 ) was the wife of King George VI and the mother of Queen Elizabeth II and Princess Margaret , Countess of Snowdon .