The War of the League of the Public Weal: the Complementarity Relation Between Duke of Bourbon and King Louis XI Kozo UEDA The War of the League of the Public Weal broke out in 1465. The local feudal lords formed the League of the Public Weal against the Louis XI' policy that was managed only by the King's favorable retainers. The dukes defeated the royal army and got the advantageous terms. In light of history, however, this battle has been generally regarded as just a part of the process that King Louis XI incorporated the dukes under his power by taking a conciliatory approach. To put it simply, all the measures were merely calculated to break up the League. There is a gap between historians' perception and historical evidence. The purpose of this study is to compensate this gap and address the meaning of the battle. First, the author reviewed King Louis XI's general evaluation. He placed the right person in the right jobs and governed the country appropriately as the situation demands. It is not necessarily true that he wanted to undermine the dukes to take them control. Next, let's focus on the outcome of the war. Duke of Bourbon, one of the most disaffected lords among the league, got the chief position at the military ordonnance. From the reign of King Charles VII, it was customary to take over the important post of the royal army by the Bourbons. They put the profit from this position into their territory. That's the real reason he wanted to get the position. This battle was the dialogue between the dukes and the King. King Louis XI accepted the claims from the dukes and grasped the problems of France. This reminded him of the significance of the dukes. Consequently, he accepted and satisfied the dukes' needs. The war brought about the cooperative framework between King and the dukes rather than strong power of King.