Passauer Vertrag
Prince Wolfgang met with Martin Luther at the 1521 Diet of Augsburg and implemented the Protestant Reformation in his territories; the second Prince of the Holy Roman Empire to do so after the Saxon elector Frederick the Wise. He also became a leading member of the Protestant League of Torgau and the Schmalkaldic League against the policies of the Habsburg emperor Charles V. Temporarily banned, his possessions were restored in the 1552 Peace of Passau. Without heirs, Wolfgang in 1562 ceded Anhalt-Köthen to his cousins Joachim Ernest and Bernhard VII of Anhalt-Zerbst. Upon Bernhard's death in 1570, all Anhalt territories were formally re-united under Joachim Ernest's rule.