Count of Toulouse, Raymond VI, left the Capetian side and joined Richard's. He was followed by Baldwin IV of Flanders, the future Latin Emperor, as this one was contesting Artois to Philip II. In 1197, Henry VI died and was replaced by Otto IV, Richard I's own nephew. Renaud de Dammartin, the Count of Boulogne and a skilled commander, also deserted Philip II. Baldwin IV was invading Artois and captured Saint-Omer while Richard I was campaigning in Berry and inflicted a severe defeat on Philip II at Gisors, close to Paris. A truce was accepted, and Richard I had almost recovered all Normandy and now held more territories in Aquitaine than he had before. Richard I had to deal with a revolt once again, but this time from Limousin. He was struck by a bolt in April 1199 at Châlus-Chabrol and died of a subsequent infection. His body was buried at Fontevraud like his father. Collapse of the Angevin Empire John's accession to the throne Following the news of King Richard I's death in 1199, John attempted to seize the Angevin treasury at Chinon in order to impose his control of the Angevin government. Angevin custom, however, gave John's nephew, Duke Arthur, son of Geoffrey of Brittany, a stronger claim on Richard's throne, and the nobles of Anjou, Maine, and Touraine declared in favour of Arthur on 18 April 1199. Philip II of France had taken Évreux and the Norman Vexin, and a Breton army had seized Angers by this point. Le Mans refused to declare allegiance to John, so he ran to Normandy, where he was invested as duke in Rouen on 25 April. He returned to Le Mans with an army where he punished its citizens and then left for England. England had declared its support for John thanks to William Marshal and Archbishop Hubert Walter of Canterbury's support. He was crowned on 27 May in Westminster Abbey. Due to his mother's support, Aquitaine and Poitou supported John, and only Anjou, Maine, Touraine, and Brittany remained disputed. In May, Aimeri, Viscount of Thouars, who was chosen by John to be his seneschal in Anjou, attacked Tours in an attempt to capture Arthur of Brittany. Aimeri failed, and John was forced to return to the continent in order to secure his rule, through a truce with Philip II, after Philip had launched attacks on Normandy. Philip was forced into