The War of the Roses getting wild in England. Those four pretender armies each represent a different pretender.
When King Richard of York sent the great part of his army to Spain to aid his ally Naples in its brave fight for independence, his arch-rival William of Lancaster took the opportunity to launch an uprising in the North. The petty king of Ulster, seeing his chance to put a pro-Irish king on the English throne, lent money and men to the pretender Jacob, Duke of Buckingham, allowing him to raise an army of eight thousand; after successfully besieging and occupying the Pale, Buckingham was soon able to draw more men to his banner.
With unrest, war and famine in the land and widespread dissatisfaction amongst the peasantry, a Lollard uprising began in Kent. Within three months, the Lollards, by this point numbering more than twenty thousand, marched on London, and within two years the city had capitulated to the peasants, forcing the king to flee humiliatingly to Wales.
Richard of York, dying without a male heir, was replaced in a swift palace coup by his former adviser Richard Button, who married Richard's daughter to grant his reign legitimacy. However, he was himself deposed within six months by Richard's cousin, Edward of York, who eventually brought peace to the land of England. The Lollards, undefeated in the field and with their support only growing amongst the peasants and the people of London, were granted the right to worship freely, and the worst excesses of the clergy curbed by the king's command.