Elisabeth Brooke (25 June 1526 – 2 April 1565) was an English courtier and noblewoman. She the eldest daughter of George Brooke, 9th Baron Cobham of Kent and Anne, his wife. She was the niece of Sir Thomas Wyatt the elder, the courtier-poet credited with bringing the sonnet form into the English language, and Elizabeth Brooke who was associated with Henry VIII of England. Elisabeth openly lived in adultery with William Parr, 1st Marquess of Northampton and bigamously married him. At times, she was accepted at court as the Marchioness of Northampton. She was the sister-in-law of Katherine Parr, King Henry VIII's sixth queen. Her first cousin, Thomas Wyatt the Younger, was the leader of a rebellion against Queen Mary I known as Wyatt's Rebellion. The whole family was implicated. She became o