A group of magnates consisting of the king's uncle Thomas of Woodstock, 1st Duke of Gloucester, Richard FitzAlan, 11th Earl of Arundel, and Thomas de Beauchamp, 12th Earl of Warwick, became known as the Lords Appellant when they sought to impeach five of the king's favourites and restrain what was increasingly seen as tyrannical and capricious rule. Later they were joined by Henry Bolingbroke, the son and heir of John of Gaunt, and Thomas de Mowbray, 1st Duke of Norfolk. Initially, they were successful in establishing a commission to govern England for one year, but they were forced to rebel against Richard, defeating an army under Robert de Vere, Earl of Oxford, at the skirmish of Radcot Bridge. Richard was reduced to a figurehead with little power. As a result of the Merciless Parliament, de Vere and Michael de la Pole, 1st Earl of Suffolk, who had fled abroad, were sentenced to death in their absence. Alexander Neville, Archbishop of York, had all of his worldly goods confiscated. A number of Richard's council were executed. Following John of Gaunt's return from Spain, Richard was able to rebuild his power, having Gloucester murdered in captivity in Calais. Warwick was stripped of his title. Bolingbroke and Mowbray were exiled. When John of Gaunt died in 1399, Richard disinherited Henry of Bolingbroke, who invaded England in response with a small force that quickly grew in numbers. Meeting little resistance, Henry deposed Richard to have himself crowned Henry IV of England. Richard died in captivity early the next year, probably murdered, bringing an end to the main Plantagenet line.
