The capital of Nassau was moved from Weilburg to Wiesbaden , and the city became the ducal residence .
At the 1815 Congress of Vienna , the Duchy of Nassau joined the German Confederation .
The capital of Duchy of Nassau was moved from Weilburg to Wiesbaden , and the city became the ducal residence .
At the 1815 Congress of Vienna , the Duchy of Nassau joined the German Confederation .