"William VI (4 July 1535 – 20 August 1592), called William the Younger (German: Wilhelm der Jüngere), was Duke of Brunswick-Lüneburg and Prince of Lüneburg from 1559 ...
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until his death. Until 1569 he ruled together with his brother, Henry of Dannenberg.
William was the son of Ernest I, Duke of Brunswick-Lüneburg. On 12 October 1561 he married Dorothea of Denmark (29 June 1546 Kolding–6 January 1617 Winsen), daughter of Christian III of Denmark and Dorothea of Saxe-Lauenburg.
In 1582, William began suffering from fits of insanity. These fits caused his wife to flee him in 1584 for her own safety." - (en.wikipedia.org 17.10.2020)
