by Gloucester's enemies, the earl of Suffolk, whom Margaret held in great esteem, and the aging Cardinal Beaufort and his nephew, Edmund Beaufort, Earl of Somerset. Gloucester was put in custody in Bury St Edmunds, where he died, probably of a heart attack (although contemporary rumours spoke of poisoning) before he could be tried. The Duke of York, being the most powerful duke in the realm, and also being both an agnate and the heir general of Edward III (thus having, according to some, a better claim to the throne than Henry VI himself), probably had the best chances to succeed to the throne after Gloucester. However, he was excluded from the court circle and sent to govern Ireland, while his opponents, the earls of Suffolk and Somerset, were promoted to dukes, a title at that time still normally reserved for immediate relatives of the monarch. The new duke of Somerset was sent to France to assume the command of the English forces; this prestigious position was previously held by the duke of York himself, who was dismayed at his term not being renewed and at seeing his enemy take control of it. In the later years of Henry's reign, the monarchy became increasingly unpopular, due to a breakdown in law and order, corruption, the distribution of royal land to the king's court favourites, the troubled state of the crown's finances, and the steady loss of territories in France. In 1447, this unpopularity took the form of a Commons campaign against William de la Pole, 1st Duke of Suffolk, who was the most unpopular of all the king's entourage and widely seen as a traitor. He was impeached by Parliament to a background that has been called "the baying for Suffolk's blood [by] a London mob", to the extent that Suffolk admitted his alarm to Henry. Ultimately, Henry was forced to send him into exile, but Suffolk's ship was intercepted in the English Channel. His murdered body was found on the beach at Dover. Henry's mental health began to fray at the seams in the late 1440s. He exhibited possible signs of paranoia (the arrest of the Duke Humphrey in 1447) and grandiosity (the scale of his plans of expansion for Eton Chapel in 1449 and King's College in 1446). By 1449, Henry had many critics questioning his ability to rule due to his mental health. In 1449, the Duke