Fitzalan was closely aligned with Thomas, Duke of Gloucester, who was uncle of King Richard II. Thomas was opposed to Richard II's desire for peace with France in the Hundred Years War and a power struggle ensued between him and Gloucester. In late 1386, Gloucester forced King Richard II to name himself and Richard Fitzalan to the King's Council. This Council was to all intents and purposes a Regency Council for Richard II. However, Richard limited the duration of the Council's powers to one year.
In 1386, Richard II named Richard Fitzalan Admiral of England and made him a Knight of the Garter. As Admiral of England, he defeated a Franco-Spanish-Flemish fleet off Margate in March 1387, along with Thomas de Mowbray, Earl of Nottingham.
The King summoned Gloucester and Fitzalan to a meeting. However, instead of coming, they raised troops and defeated the new Council at Radcot Bridge on 22 December 1387. During that battle, they took the favourites prisoner. The next year, the Merciless Parliament condemned the favourites. FitzAlan was one of the Lords Appellant who accused and condemned Richard II's favorites. He made himself particularly odious to the King by refusing, along with Gloucester, to spare the life of Sir Simon de Burley who had been condemned by the Merciless Parliament. This was even after the queen, Anne of Bohemia, went down on her knees before them to beg for mercy. King Richard never forgave this humiliation and planned and waited for his moment of revenge. Arundel was named Governor of Brest in 1388.
Opposed to peace
Peace was concluded with France in 1389. However, Richard FitzAlan followed Gloucester's lead and stated that he would never agree with the peace that had been concluded.
Lady Eleanor Fitzalan, on 28 October 1371, at the age of about six, married Robert de Ufford. Died childless.
Elizabeth Fitzalan, married first William Montacute ; no issue. Married second, in 1384, Thomas Mowbray, 1st Duke of Norfolk; had issue. Married third, before August 1401, Sir Robert Goushill of Hoveringham; had issue. Married fourth, before 1411, Sir Gerard Usflete, son of Sir Gerard Usflete, MP, without issue.
By 1394, Arundel was again a member of the royal council, and was involved in a quarrel with John of Gaunt, whom he accused in the parliament of that year. Fitzalan further antagonized the King by arriving late for the queen's funeral. Richard II, in a rage, snatched a wand and struck Fitzalan in the face and drew blood. Shortly after that, the King feigned a reconciliation but he was only biding his time for the right moment to strike. Arundel was persuaded by his brother Thomas to surrender himself and to trust to the king's clemency. On 12 July 1397, Richard was arrested for his opposition to Richard II, as well as plotting with Gloucester to imprison the king. He stood trial at Westminster and was attainted. He was beheaded on 21 September 1397 and was buried in the church of the Augustin Friars, Bread Street, London. Tradition holds that his final words were said to the executioner, "Torment me not long, strike off my head in one blow". In October 1400, the attainder was reversed, and Richard's son Thomas succeeded to his father's estates and honours.