Nassau-Weilburg was a historical principality located in what is now Germany. It emerged in the 16th century as a branch of the House of Nassau, which played a significant role in the region's politics. The principality was known for its picturesque landscapes and strategic location along trade routes. The capital of Nassau-Weilburg was Weilburg, a town that features a notable castle and charming architecture. The principality was eventually incorporated into the Duchy of Nassau in the 19th century, which later became part of the German Empire. Today, the area is recognized for its rich history and cultural heritage.