After John III's death on 11 June 1420, the two principalities were reunited under Frederick VI, who had become Elector Frederick I of Brandenburg in 1415. Upon Frederick I's death on 21 September 1440, his territories were divided between his sons; John received the principality of Bayreuth (Brandenburg-Kulmbach), Frederick received Brandenburg, and Albert received Ansbach.
John succeeded his father as elector in 1486, while the Franconian possessions of the Hohenzollern dynasty passed to his younger brothers Frederick I and Siegmund. He decreed that the Stadtschloss in Berlin , erected at the behest of his uncle Frederick II, should serve as the permanent residence of the Brandenburg electors, the beginning of the city's history as a state capital.
John Frederick, Margrave of Brandenburg-Ansbach (father of 187) 375. Princess Eleonore Erdmuthe of Saxe-Eisenach (mother of 187) 376. William Henry, Prince of Nassau-Usingen (father of 188) 377. Charlotte Amalie, Countess of Nassau-Dillenburg (mother of 188) 378. John William III, Duke of Saxe-Eisenach (father of 189) 379.
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