The Principality of Nassau-Siegen was a small German principality located in the region of Westphalia. It emerged in the 16th century and was part of the larger Nassau family of territories. The principality was known for its rich cultural heritage and played a role in the political landscape of the Holy Roman Empire. In 1806, the principality was dissolved and incorporated into the Grand Duchy of Berg. The area later became part of the Prussian province of Westphalia in the 19th century. Today, the historical significance of Nassau-Siegen is remembered through its contributions to regional history and culture.