John II of Nassau-Siegen was a German nobleman born in 1604, known for his role as a military leader during the Thirty Years' War. He was a member of the House of Nassau and served as a general in the service of the Dutch Republic, where he gained recognition for his strategic skills and leadership. In 1640, John II became the Count of Nassau-Siegen, a title that reflected his family's long-standing influence in the region. He was also involved in various political and military alliances, contributing to the complex dynamics of European power during his time. John II passed away in 1674.