Duke Louis of Nassau-Saarbrücken was a German nobleman born in 1604. He belonged to the House of Nassau, a prominent family in European history. Louis ruled the principality of Saarbrücken and was known for his efforts to strengthen his territory during a time of political instability in the region. He played a significant role in the Thirty Years' War, which affected much of Europe from 1618 to 1648. Duke Louis sought to maintain the independence of his lands while navigating the complex alliances and conflicts of the era. His leadership contributed to the resilience of Nassau-Saarbrücken during these turbulent times.