William II the Great (c. 940/945 – 24 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
