In the meanwhile, the political situation had changed radically. The Duke of Burgundy, John the Fearless, was assassinated in September 1419, and the French Dauphin Charles, brother of Jacqueline's first husband, was considered an accomplice and was therefore disinherited in 1420 under the Treaty of Troyes. King Henry V of England then claimed to be the King of France. In February 1421 Jacqueline issued a statement where she stated that, because of the destructive behaviour of John IV of Brabant, she wanted the annulment of her marriage. The fight against John III, continued until the capture of the city of Leiden, the last city loyal to Jacqueline; after this, she had to admit defeat.