a Count of Saarbrücken. In 1616 William Louis became co-regent with his father. His father died in 1627 and he became guardian of his two youngest brothers, Otto and Ernest Casimir. On 29 January 1629 in Ottweiler, the inheritance was split and William Louis received the County of Saarbrücken, the Office Ottweiler, the Bailiwick of Herbitzheim, and the Community of Saarwellingen. His brother John received Idstein, Wiesbaden and Sonnenberg. William Louis remained Regent of Wehen and the district of Burgschwalbach, the territories of his two youngest brothers, as they were still minors.
