Edward VI died on 6 July 1553. Lady Jane was declared queen on 10 July. The Duchess joined her for the proclamation and during her stay in the Tower. She had been fetched when Northumberland realised Jane's confusion and overwhelming feelings, and she managed to calm her daughter down. Since she had seen the King himself and spoken to him about the succession, she could convince Jane that she was the rightful queen and heir. Their success was short-lived. Jane was deposed by armed support in favour of Mary I on 19 July 1553.