 It was integrated into the Burgundian Circle of the Holy Roman Empire, by Emperor Charles V in the Pragmatic Sanction of 1549.During the French Revolutionary Wars, Luxembourg was annexed to the department of Forêts.Following agreement at the 1815 Congress of Vienna, some of the former duchy's territory became the Grand Duchy of Luxembourg under the rule of, but not part of, the Kingdom of the Netherlands, after which it joined the German Confederation.