Lady Mary Sidney was a lady-in-waiting at the court of Elizabeth I, wife of Sir Henry Sidney and the mother of Sir Philip Sidney and Mary Sidney Herbert, Countess of Pembroke. She was daughter of John Dudley, Duke of Northumberland, and sister of Elizabeth's favourite, Robert Dudley, Earl of Leicester.
Mary Sidney by Hans Eworth, c. 1550–1555
Sir Henry Sidney was an English soldier, politician and Lord Deputy of Ireland.
Portrait by Arnold Bronckorst, 1573
Sir Henry Sidney sets out from Dublin Castle. Detail from a plate in The Image of Irelande, by John Derrick (London, 1581).