 That county was divided in 1629 into the lines of Nassau-Weilburg, Nassau-Idstein and Nassau-Saarbrücken that was divided only 30 years later in 1659.The emerging counties were Nassau-Saarbrücken, Nassau-Ottweiler and Nassau-Usingen.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).