ネーデルラント継承戦争
Aachen hosted several Peace conferences, those ending the War of Devolution and the War of the Austrian Succession. By the Treaty of Aix-la-Chapelle, dated 2 May 1668, Louis XIV of France was compelled, by the Triple Alliance between Kingdom of England, the Dutch Republic, and the Kingdom of Sweden, to abandon the War of Devolution against Southern Netherlands. The treaty forced the King to restore the County of Burgundy, which he had conquered, and to be content with owning twelve Flemish fortifications. The second Treaty of Aix-la-Chapelle, dated 18 October 1748, ended the War of the Austrian Succession. By the terms of the Treaty of Lunéville, Aachen was incorporated in the French First Republic as chief town in the Roer Department. Later, the Congress of Vienna gave Aachen to the Kingdom of Prussia.