Catherine Carey a biographer of Mary Boleyn, Alison Weir, claims that a young Catherine stayed overnight to entertain and distract her aunt Anne in the Tower the morning before the execution are not correct. 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
Catherine Howard "jewel of womanhood". He received there a warrant of the queen's arrest that described her crimes. On 7 November 1541, Archbishop Cranmer led a delegation of councillors to Winchester Palace, Southwark, to question her. Even the staunch Cranmer found Catherine's frantic, incoherent state pitiable, saying, "I found her in such lamentation and heaviness as I never saw no creature, so that it would have pitied any man's heart to have looked upon her." He ordered the guards to remove any objects that she might use to commit suicide. Establishing the existence of a precontract between Catherine and Dereham would have