the truce due to John's support from fifteen French counts and support from counts in the Lower Rhine, such as with Count Baldwin of Flanders, who he met in August 1199 in Rouen, and Baldwin did John homage. From a position of strength, John was able to go on the offensive, and he won William des Roches, Arthur's candidate for the Angevin seneschal, to his cause following an incident with Philip. William des Roches also brought Duke Arthur and his mother, Constance, as prisoners to Le Mans on 22 September 1199, and the succession appeared to have been secured in favour of John. Despite the escape of Arthur and Constance with Aimeri of Thouars to Philip II, and many of Richard's previous allies in France, including the counts of Flanders, Blois, and Perche, leaving for the Holy Land, John was able to make peace with Philip that secured his accession to his brother's throne. John met with Philip and signed the Treaty of Le Goulet in May 1200, where Philip accepted John's succession to the Angevin Empire, and Arthur became his vassal, but John was forced to break his German alliances, accept Philip's gains in Normandy, and cede lands in Auvergne and Berry. John was also to accept Philip as his suzerain overlord and pay Philip 20,000 marks. As W. L. Warren notes, this Treaty began the practical dominance of the French king over France, and the ruler of the Angevin Empire was no longer the dominating noble in France. In June 1200, John visited Anjou, Maine, and Touraine, taking hostages from those he distrusted, and visiting Aquitaine, where he received homage from his mother's vassals, returning to Poitiers in August. Lusignan rebellion and the Anglo-French war Following the annulment of John's first marriage to Isabelle of Gloucester, John married Isabella, the daughter and heiress of Count Aymer of Angoulême, on 24 August 1200. Angoulême had considerable strategic significance, and the marriage made "very good political sense", according to Warren. However, Isabella had been betrothed to Hugh of Lusignan, and John's treatment of Hugh following the marriage, including the seizure of La Marche, led Hugh to appeal to Philip II. Philip summoned John to his court, and John's refusal resulted in the confiscation of John's continental possessions excluding Normandy in April 1202 and Philip accepting Arthur's homage for the lands in July. Philip went on to invade Normandy as far