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William (German Wilhelm; c. 1392 – 1482), called the Victorious, was duke of Brunswick-Lüneburg. He is counted either as William III or William IV.
William was the eldest son of Henry the Mild, Duke of Brunswick-Lüneburg. He inherited Lüneburg-Celle in 1416 and swapped it with his uncle Bernard I, Duke of Brunswick-Lüneburg, for Wolfenbüttel in 1428. In 1432, while on a campaign, William was deposed by his brother Henry. He retained only the western part of Wolfenbüttel (to the west of the River Leine and separated from the rest by the Bishopric of Hildesheim), which was to become known as Calenberg. After Henry died without son in 1473, William had control of both parts of Wolfenbüttel again.
Family
William married Cecilia (died 1449), daughter of Frederick I, Elector of Brandenburg, in 1423. They had the following children:
He married Matilda, daughter of Otto II, Count of Holstein-Schauenburg-Pinneburg, in 1466. They had no children that reached adulthood.
References
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