William Shakespeare 
Henry VI, Part 3 

Upon reaching the parliamentary chambers in London, York seats himself in the throne, and a confrontation ensues between his supporters and Henry’s. Threatened with violence by Warwick, who has brought part of his army with him, the King reaches an agreement with York which will allow him to remain king until his death, at which time the throne will permanently pass to the House of York and its descendants. Disgusted with this decision, which would disinherit the King’s son, Prince Edward, the King’s supporters, led by his wife, Margaret, abandon him, and Margaret declares war on the Yorkists, supported by Clifford, who is determined to exact revenge for the death of his father at the hands of York during the battle of St Albans.