Charles Theodore too had no legitimate heirs, so his prospective successor was his Palatine cousin, Duke Charles II August of Zweibrücken (1746–1795). Charles August objected to an agreement which would deprive him of the Bavarian inheritance; he appealed to the Imperial Diet in Regensburg. His cause was taken up by the Prussian king Frederick the Great, who refused any increase in Austrian territory, and by Saxony, whose Wettin electoral house had married into the Wittelsbach family and therefore had allodial claims to parts of the inheritance.