Catherine Carey, after her marriage Catherine Knollys and later known as both Lady Knollys and Dame Catherine Knollys, (c. 1522 – 15 January 1569), was chief Lady of the Bedchamber to Queen Elizabeth I, who was her first cousin. Biography Catherine Carey was born in 1522, 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 thus Elizabeth I's maternal first cousin. Some historians believe that Catherine was an illegitimate child of Henry VIII, which would make her also Elizabeth I's paternal half-sister through their shared father, Henry VIII. Catherine was said to be a witness to the execution of her aunt, Anne Boleyn, in 1536; however, claims that she had stayed overnight to entertain and distract her aunt Anne in the Tower of London before the latter's execution have been dismissed. Catherine went on to become Maid of Honour to both Anne of Cleves and Catherine Howard, the fourth and fifth wives of Henry VIII. On 26 April 1540 she married Sir Francis Knollys. Her husband was named a Knight of the Garter in 1593, although he had already been knighted in 1547. He was also Treasurer of the Royal Household. From the time of her marriage, Catherine became known as Mistress Knollys, and from 1547 as Lady Knollys. When not in London, the couple lived at Reading in Berkshire and Rotherfield Greys in Oxfordshire, and because they were staunch Protestants, they fled to Germany during the reign of Queen Mary I. Princess Elizabeth wrote to her cousin there, and Catherine was appointed Chief Lady of the Bedchamber after Elizabeth became queen. For the first ten years of the reign, Lady Catherine combined the most senior post among the ladies-in-waiting with motherhood to more than a dozen children. Elizabeth never recognized Catherine as her half-sister, and it was certainly not a relationship that Catherine or Sir Francis ever openly claimed. At court, Catherine was acknowledged as the queen's favourite among her first cousins, and Elizabeth's lack of other female relatives to whom she felt close may be adequate to explain this favoured position. She died on 15 January 1569 at Hampton Court Palace, being outlived by her husband and children, and was buried the following April in St Edmund's Chapel in Westminster