Dereham is known for his sexual indiscretions with
Catherine Howard, the fifth wife of King
Henry VIII of England. The relationship started in 1538, when Francis was 32 years old and Catherine was around 15, before she became queen. During their affair, Catherine and Francis both lived in the household of
Agnes Howard, Dowager Duchess of Norfolk, 2nd wife of Thomas Howard, 2nd Duke of Norfolk, in Norfolk House in Lambeth. Francis Dereham's maternal grandmother, Elizabeth Tylney, was the aunt of both of Thomas Howard's wives (who were 1st cousins) making Francis and Catherine Howard 2nd cousins 1x removed. Before getting involved with Catherine, Dereham was having an affair with
Joan Bulmer, who lived in the same household. Dereham's relationship with Catherine came to an end when her music master, Henry Mannox, sent an anonymous letter to the Dowager Duchess. Mannox, who had started a sexual relationship with Catherine and molested her when she was 13, suggested that the Duchess should visit Catherine's bedroom "half an hour after" going to bed, adding that "you shall see that which shall displease you". As a result, Dereham was sent away and Catherine was told off for her "banqueting by night" because the Duchess feared "it would hurt her beauty".
David Starkey has argued that the Duchess was more concerned about Catherine's looks than her morals. Dereham was forced to go to live in
Ireland, where it is believed he resorted to piracy. Before he left, he asked Catherine to look after £100. This money was the bulk of his savings, and Catherine, when later Queen, said that he told her that if he did not return "I was to consider it as my own". In late 1539, Catherine was made
lady-in-waiting to the King's fourth wife,
Anne of Cleves. Subsequently, Dereham was appointed as a secretary at
Hampton Court, an appointment possibly engineered by the Dowager Duchess to silence him about Catherine's previous indiscretions. On 27 August 1541, using the Dowager Duchess as a reference, Dereham approached his former lover at
Pontefract Castle, seeking employment while the court was still in progress. Queen Catherine made him her Private Secretary and then a
Gentleman Usher of the Queen's Chamber. Dereham explained that if the King died, he would marry Catherine, boasting that he had been generously favoured. This arrogance, possibly intended to arouse the jealousy of
Thomas Culpeper, caused some consternation at court. Dereham had a violent temper and, after getting drunk, he attacked
John Fell, a Gentleman Usher of similar standing, who had questioned Dereham's pleasure at remaining seated after a Queen's Council meeting. When their past relationship was brought to the attention of Archbishop
Thomas Cranmer by a
chamberer in the Dowager Duchess's household,
Mary Lassells, he reported them to the King in a letter. This provoked an investigation that resulted in the arrests of the Dowager Duchess, her son
William Howard, 1st Lord Howard of Effingham, Thomas Dereham (Francis' brother), Thomas Culpeper, Queen Catherine herself, and eventually
Lady Rochford, one of Catherine's ladies-in-waiting. Under interrogation, Dereham admitted to a pre-marital relationship with Catherine, but claimed that they had never been intimate after Catherine's marriage. Furthermore, he maintained that he had been supplanted in her affections by Culpeper. Cranmer was faced with the rumours of a pre-contract of marriage between Dereham and Catherine. Such a pre-contract would have been as binding as a marriage, especially if the couple had sealed the agreement with sexual relations. If this were the case, Catherine's marriage to the King would have been unlawful. However, no evidence exists to support this allegation; incriminating documents are thought to have been burned by the Dowager Duchess, as it is recorded that she raided Dereham's coffers and destroyed their letters. A supposed love letter from Catherine was used as evidence of her adultery. Dereham admitted, even under torture, only that there had been a pre-contract of marriage. Catherine admitted having sexual relations on many occasions with Dereham but claimed that they practised a method of birth control and, perhaps in her fear, blamed Dereham for forcing himself on her. When interrogated again, Dereham denied any post-marital intercourse, but claimed that Culpeper "had succeeded him in the Queen's affections". ==Execution==