 The Duke attempted to form an alliance with the Seymours through a marriage between his widowed daughter, Mary Howard, and Hertford's brother, Thomas Seymour, but the effort was forestalled by the provocative conduct of the Duke's eldest son and heir, Henry Howard, Earl of Surrey, who had displayed in his own heraldry the royal arms and insignia.On 12 December 1546 both Norfolk and Surrey were arrested and sent to the Tower.On 12 January 1547 Norfolk acknowledged that he had 'concealed high treason, in keeping secret the false acts of my son, Henry Earl of Surrey, in using the arms of St. Edward the Confessor, which pertain only to kings', and offered his lands to the King.