Mary Herbert (née Sidney), Countess of Pembroke, writer and literary patron, was born on 27th October 1561 at Tickenhall, near Bewdley in Worcestershire. She was the third daughter of Sir Henry Sidney and his wife, Mary (née Dudley), daughter of John Dudley, Duke of Northumberland, and she was the sister of the poets Sir Philip Sidney and Robert Sidney (later Earl of Leicester).

Mary’s parents were loyal servants of the Crown. Edward VI had died in Mary’s father’s arms and Mary’s mother had nursed Elizabeth I through smallpox, and been badly disfigured as a result of contracting the disease. Mary was also the niece of Robert Dudley, Earl of Leicester, Elizabeth I’s favourite, and Ambrose Dudley, Earl of Warwick.