Why did Louis XI support the House of Lancaster in England?

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Louis XI supported the House of Lancaster against the Yorkist King Edward IV primarily as a strategic maneuver to undermine the Anglo-Burgundian alliance.1

Following his humiliation during negotiations with Charles the Bold at PĂ©ronne in 1468, Louis sought to neutralize the threat posed by the coalition of his enemies—which included Charles the Bold, Edward IV, and Francis II of Brittany. By assisting the ousted Lancastrians, Louis hoped to destabilize Edward IV’s rule and break the alliance that was actively working against French royal authority.1

However, this policy proved unsuccessful. The final defeat of the Lancastrian forces in May 1471, which included the death of Prince Edward and the subsequent murder of Henry VI, effectively ended Louis XI’s hopes of using the House of Lancaster to counter his rivals.12