Which of these Kings of England reigned for less than three months?

Edward V (2 November 1470 – c.1483) was King of England from his father Edward IV's death on 9 April 1483 until 26 June of the same year. He was never crowned, and his 86-day reign was dominated by the influence of his uncle and Lord Protector, Richard, Duke of Gloucester, who succeeded him as Richard III on 26 June 1483; this was confirmed by the Act entitled Titulus Regius, which denounced any further claims through his father's heirs.

Edward and his younger brother Richard of Shrewsbury, Duke of York, were the Princes in the Tower who disappeared after being sent to heavily-guarded royal lodgings in the Tower of London. Responsibility for their deaths is widely attributed to Richard III, but the lack of any solid evidence and conflicting contemporary accounts also suggest other possible suspects.