The Principality of Nassau-Saarbrücken was a small German state that existed from the late 16th century until the early 19th century. It was part of the larger territory of the County of Nassau and was located in the region of Saarland in present-day Germany. The principality was established when the House of Nassau divided its territories, and it became a significant center for trade and culture during its existence. In 1806, the principality was incorporated into the Grand Duchy of Berg and later became part of the Kingdom of Prussia in 1815. The area is known for its historical significance and its role in the development of regional governance in Germany. Today, remnants of its history can be seen in local architecture and cultural heritage.