Reichskreis
Emperor Rudolf then declared an Imperial ban on the town and ordered Maximilian I, Duke of Bavaria to execute the ban. Facing his army, the town surrendered. According to Imperial law, the disciplinary measures should not have been executed by the Catholic duke of Bavaria, but by the Protestant duke of Württemberg, who, like Donauwörth, was a member of the Swabian Imperial Circle. Maximilian "de facto" absorbed the former Free Imperial City, which was a violation of Imperial law as well.