John, King of England treatment of many of England's most powerful nobles. Although both John and the barons agreed to the " peace treaty in 1215, neither side complied with its conditions. Civil war broke out shortly afterwards, with the barons aided by Louis of France. It soon descended into a stalemate. John died of dysentery contracted whilst on campaign in eastern England during late 1216; supporters of his son Henry III went on to achieve victory over Louis and the rebel barons the following year. Contemporary chroniclers were mostly critical of John's performance as king, and his reign has since been the subject
Isabella of Portugal, Duchess of Burgundy Isabella of Portugal, Duchess of Burgundy Isabella of Portugal (22 February 1397 – 17 December 1471) was Duchess of Burgundy as the third wife of Duke Philip the Good. Born a Portuguese "infanta" of the House of Aviz, Isabella was the only surviving daughter of King John I of Portugal and his wife Philippa of Lancaster. Her son by Philip was Charles the Bold, the last Valois Duke of Burgundy. Isabella was the regent of the Burgundian Low Countries during the absence of her spouse in 1432 and in 1441–1443. She served as her husband's representative in negotiations with England