At the age of 10 or 12, Catherine was sent to complete her upbringing in the household of the Dowager Duchess of Norfolk, her step-grandmother.
Catherine was caught alone with Manox ( a music master) on more than one occasion by the Duchess and "she gave Catherine two or three blows".
When Catherine transferred her "favours" to Francis Dereham, (a Howard cousin), Mannox, jealous and frustrated, informed the Duchess by an anonymous letter which was laid on the Duchess's pew.
Catherine's relationships with Manox and Dereham were an open secret in the Duchess's household with Starkey, in his wonderful book, describing the household of the Duchess of Norfolk as a loosely run boarding school and the Duchess herself as a lax "headmistress".