(Oct. 1Nov. 15, 1818) First of four congresses held by Britain, Austria, Prussia, Russia, and France to address European problems following the Napoleonic Wars .
At Aix-la-Chapelle (now Aachen, Ger.), the participants accepted an offer by France to pay most of the war indemnity owed to the allies in exchange for the withdrawal of their armies of occupation. France was also admitted to the new Quintuple Alliance.