Philip I, Count of Flanders

Timeline

1. 1181–1184Vermandois · VermandoisAfter Isabelle of Vermandois died in 1182, Philip claimed Vermandois in right of his wife's family and went to war with Philip II, ravaging Picardy and Île-de-France. In 1184 Baldwin V of Hainaut briefly intervened to mediate, while the French king exploited internal divisions to play Flanders and Hainaut against each other.
2. 1185–1189Boves · PicardyThe Treaty of Boves in July 1185 forced Philip to cede Amiens and other places while retaining part of Vermandois. After the treaty he maintained a flourishing textile and trade sector in Flanders and patronized courtly literature such as that of Chrétien de Troyes. Relations with the French royal house grew more cooperative in the late 1180s as preparations began for the Third Crusade.
3. 1190Bruges · County of FlandersIn 1190 Philip took the cross for a second time, leading a Flemish crusading force to join the armies already bound for Palestine, with his wife Theresa of Portugal acting as regent in his absence. He arrived at the siege of Acre in late 1190 or early 1191, joining Philip II and Richard I among others.