Palatinate-Landsberg was a state of the Holy Roman Empire based around Landsberg in northeastern France. Palatinate-Landsberg was the intermediate partition of Palatinate-Zweibrücken in 1604 for Frederick Casimir, the youngest son of John I, Count Palatine of Zweibrücken. Landsberg was invaded and devastated during the Thirty Years' War. In 1645 Frederick Casimir was succeeded by his son Frederick Louis. Frederick Louis inherited the Duchy of Zweibrücken in 1661 with its seat in the Imperial Diet. After dying in 1681 without legitimate descendants, Palatinate-Landsberg passed to the Kings of Sweden. House of Wittelsbach Counties of the Holy Roman Empire 1604 establishments in the Holy Roman Empire