Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Nassau-Saarbrücken was a county of the Holy Roman Empire in the Upper Rhenish Circle. It belonged to the Walram branch of the House of Nassau.Around the year 1080 Count Sigibert in the Franconian Saargau was vested with the whole possessions of the bishop of Metz along the Saar river, the Rhine and in Alsace as a fiefdom. In 1123 his son uses the title of "Count of Saarbrücken". In 1180 the county was divided into two parts, when the territories along the Rhine were separated to form the basis of the County of Zweibrücken. The Alsatian possessions had been lost already around 1120.