 Frederick was also successful against other opponents such as the emperor's party follower Albrecht III Achilles, Elector of Brandenburg and Diether von Isenburg, the archbishop of Mainz, and increased his territory.With the Battle of Seckenheim during the Bavarian War (1459–63) Frederick captured his antagonists Bishop George of Baden, Charles I, Margrave of Baden-Baden and Ulrich V, Count of Württemberg.In 1471/1472, Frederick married his long-time mistress Clara Tott.