A portrait John I of England
II
Richard died on 6 April 1199 in the arms of his mother; it was later said that "As the day was closing, he ended his earthly day." Because of the nature of Richard's death, he was later referred to as "the Lion (that) by the Ant was slain". According to one chronicler, Richard's last act of chivalry proved fruitless when the infamous mercenary captain Mercadier had the crossbowman flayed alive and hanged as soon as Richard died, John was chosen as the heir rather than Arthur the rightful heir.
The Treaty of Le Goulet was signed by the kings John of England and Philip II of France in May 1200 and aimed to ultimately settle the claims the Angevin kings of England had on French lands. Hence, it aimed to bring an end to the war over the Duchy of Normandy and finalise the new borders of what was left of the duchy, as well as the future relationship of the king of France and the dukes of Normandy. The treaty was a victory for Philip as it asserted his legal claims to overlordship over John's French lands.
The terms of the treaty signed at le Goulet, on the Gueuleton island in the middle of the Seine river near Vernon in Normandy, included clarifications of the feudal relationships binding the monarchs. Philip recognised John as King of England, heir of his brother Richard I, and thus formally abandoned his prior support for Arthur I, Duke of Brittany, the son of John's late brother, Geoffrey II of Brittany. John, meanwhile, formally recognised the new status of the lost Norman territories by acknowledging the Counts of Boulogne and Flanders as vassals of the kings of France, not those of England, and recognised Philip as the suzerain of the continental lands in the Angevin Empire. John also bound himself not to support any rebellions on the part of the counts of Boulogne and Flanders.
Philip had previously recognised John as suzerain of Anjou and the Duchy of Brittany, but with the treaty of le Goulet he extorted 20,000 marks sterling in payment for recognition of John's sovereignty of Brittany.
The Duchy of Aquitaine was not included in the treaty. It was still held by John as heir to his still-living mother, Eleanor. The treaty was sealed with a marriage alliance between the Angevin and Capetian dynasties. John's niece Uraque(Uracca), daughter of his sister Leonora and Alfonso VIII of Castile, married Philip's eldest son, Louis VIII of France (to be eventually known as Louis the Lion). The marriage alliance only assured a strong regent for the minority of Louis IX of France. Philip declared John deposed from his fiefs for failure to obey a summons in 1202 and war broke out again. Philip moved quickly to seize John's lands in Normandy, strengthening the French throne in the process.
The new peace would only last for two years; war recommenced in the aftermath of John's decision in August 1200 to marry Isabella of Angoulême. In order to remarry, John first needed to abandon Isabel, Countess of Gloucester, his first wife; John accomplished this by arguing that he had failed to get the necessary papal permission to marry Isabel in the first place – as a cousin, John could not have legally wed her without this. It remains unclear why John chose to marry Isabella of Angoulême. Contemporary chroniclers argued that John had fallen deeply in love with Isabella, and John may have been motivated by desire for an apparently beautiful, if rather young, girl. On the other hand, the Angoumois lands that came with Isabella were strategically vital to John: by marrying Isabella, John was acquiring a key land route between Poitou and Gascony, which significantly strengthened his grip on Aquitaine.
Unfortunately, Isabella was already engaged to Hugh of Lusignan, an important member of a key Poitou noble family and brother of Count Raoul of Eu, who possessed lands along the sensitive eastern Normandy border. Just as John stood to benefit strategically from marrying Isabella, so the marriage threatened the interests of the Lusignans, whose own lands currently provided the key route for royal goods and troops across Aquitaine. Rather than negotiating some form of compensation, John treated Hugh "with contempt"; this resulted in a Lusignan uprising that was promptly crushed by John, who also intervened to suppress Raoul in Normandy.
Although John was the Count of Poitou and therefore the rightful feudal lord over the Lusignans, they could legitimately appeal John's actions in France to his own feudal lord, Philip. Hugh did exactly this in 1201 and Philip summoned John to attend court in Paris in 1202, citing the Le Goulet treaty to strengthen his case. John was unwilling to weaken his authority in western France in this way. He argued that he need not attend Philip's court because of his special status as the Duke of Normandy, who was exempt by feudal tradition from being called to the French court. Philip argued that he was summoning John not as the Duke of Normandy, but as the Count of Poitou, which carried no such special status. When John still refused to come, Philip declared John in breach of his feudal responsibilities, reassigned all of John's lands that fell under the French crown to Arthur – except for Normandy, which he took back for himself – and began a fresh war against John.