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, Countess of Gloucester Isabella, Countess of Gloucester Isabella, Countess of Gloucester (c. 1173 – 14 October 1217), was an English noblewoman who was married to King John prior to his accession. Isabella was the daughter of William Fitz Robert, 2nd Earl of Gloucester, and his wife Hawise. Her paternal grandfather, Robert, 1st Earl of Gloucester, was the illegitimate son of King Henry I. Her father died in 1183, at which time she became Countess of Gloucester "suo jure". On 28 September 1176, King Henry II betrothed Isabella to his youngest son, John Lackland. John and Isabella were half-second cousins as great-grandchildren of Henry