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.
Frederick (Middle High German: Friderich, Standard German: Friedrich; 21 September 1371 – 20 September 1440) was the last Burgrave of Nuremberg from 1397 to 1427 (as Frederick VI), Margrave of Brandenburg-Ansbach from 1398, Margrave of Brandenburg-Kulmbach from 1420, and Elector of Brandenburg (as Frederick I) from 1415 until his death.
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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