William II the Great (c. 940/94524 December 1003) was Count of Weimar from 963 and Duke of Thuringia from 1002.
He was the eldest son of Count William I of Weimar.
Family By an unknown wife, he had children: William III (died 16 April 1039) Poppo (died 13 July before 1044) Agnes, who likely married Frederick I, Count Palatine of Saxony
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