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William (center) reading to his children.

William (4 July 1535 – 20 August 1592), called William the Younger, was Duke of Brunswick-Lüneburg in Lüneburg-Celle from 1559 until his death. Until 1569 he ruled together with his brother Henry of Dannenberg.

He was the son of Ernest I, Duke of Brunswick-Lüneburg, and married Dorothea of Denmark.

Children that reached adulthood

• Sophia (1563-1639), married George Frederick, Margrave of Brandenburg-Ansbach
• Ernest (1564-1611)
• Elizabeth (1565-1621), married Frederick, Count of Hohenlohe-Langenburg
• Christian (1566-1633)
• Augustus (1568-1636)
• Dorothea (1570-1649), married Charles, Count Palatine of Birkenfeld
• Clara (1571-1658), married William, Count of Schwarzburg-Blankenburg
• Anne Ursula (1572-1601)
• Margaret (1573-1643), married Johann Casimir, Duke of Saxe-Coburg
• Frederick (1574-1648)
• Mary (1575-1610)
• Magnus (1577-1632)
• George (1582-1641)
• John (1583-1628)
• Sybil (1584-1652), married Julius Ernest, Duke of Brunswick-Lüneburg

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