The Treaty of Loudun was signed on 3 May 1616 in Loudun, France, and ended the war that originally began as a power struggle between queen mother Marie de Medici's favorite Concino Concini (recently made Marquis d'Ancre) and Henry II de Condé, the next in line for Louis XIII's throne. The war gained religious undertones when rebellious Huguenot princes joined Condé's revolt.