Upon his victory at Mühldorf, the king took the occasion to seize the princeless Margraviate of Brandenburg, where the last Ascanian ruler Henry the Child had died without heirs in 1320. Ignoring the claims raised by Henry's Ascanian relative Duke Rudolf I of Saxe-Wittenberg, a supporter of his Habsburg rival anyway, he appointed his eldest son Louis margrave in 1323. Still a minor, he remained under tutelage of Count Berthold VII of Henneberg, who acted as a Brandenburg regent. Duke Rudolf I in late 1324 renounced the Brandenburg estates in turn for a compensation.