At the beginning of the 18th century, 3 of the Nassau lines died out and Nassau-Usingen became their successor (1721 Nassau-Idstein, 1723 Nassau-Ottweiler und 1728 Nassau-Saarbrücken).
18. sajandi alguses suri 3 Nassau liini välja ja Nassau-Usingen sai nende järglaseks (1721 Nassau-Idstein, 1723 Nassau-Ottweiler ja 1728 Nassau-Saarbrücken).