Catherine Carey, after her marriage Catherine Knollys and later Lady Knollys (c. 1524 – 15 January 1569), was chief Lady of the Bedchamber to Queen Elizabeth I, who was her first cousin.Catherine's mother was Mary Boleyn, a mistress of Henry VIII before he courted and later married her sister, Anne Boleyn. Catherine is believed by some authors to be an illegitimate child of Henry VIII. She was the wife of Sir Francis Knollys, with whom she had 14 children.Catherine Carey was born in about 1524, the daughter of William Carey of Aldenham in Hertfordshire, Gentleman of the Privy Chamber and Esquire of the Body to Henry VIII, and his wife Mary Boleyn, who had once been a mistress of the king. Catherine was Elizabeth I's first cousin. Some contemporaries also asserted that Catherine was an illegitimate child of Henry VIII, which would make her Elizabeth's half-sister. Although this was never acknowledged by the King, Catherine was given deference by the Court as she aged and came to resemble Henry. Wikipedia