King Richard the Second - S1.E2

Bolingbroke wrongly accuses Mowbray of killing Gloucester, the uncle of King Richard II. Richard (who in fact arranged the murder) orders a trial by combat between Bolingbroke and Mowbray, then turns this into exile for both of them. Bolingbroke's father, John of Gaunt, dies and Richard seizes his estates to pay for a campaign in Ireland. While Richard is off fighting the Irish, leaving the Duke of York as Regent, Bolingbroke invades England and the country rises in support of him. York vacillates, Richard lands in Wales, is arrested, and surrenders the crown to Bolingbroke, who becomes King Henry IV. A plot against Henry is discovered, Henry pardons his cousin Aumerle, but Richard is murdered while imprisoned at Pontefract.