Frederick, Duke of Brunswick-Lüneburg
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Frederick (circa 1357 – 5 June 1400) was the Duke of Brunswick-Lüneburg from 1373 and briefly King of Germany in opposition to Wenceslaus in 1400.
Frederick was the eldest son of Magnus II, Duke of Brunswick-Lüneburg, and Catherine of Anhalt-Bernburg. Like his father, he was thrust into a typical Lüneburger succession war with his brothers, which he eventually won by conquering Lüneburg itself in 1388.
In 1400, he was raised as an anti-king to Wenceslaus when he was murdered on 5 June at the annual assembly at Fritzlar by the count of Waldeck. Wenceslaus formally retained his crown until 20 August.
Frederick had married Anna (died 1400), a daughter of Wenceslaus I of Saxony-Wittenberg, in 1386. With her he had two daughters: Catherin (died circa 1439) and Anna (died 1432).
