He was a younger son of William III of Weimar and Oda, daughter of Thietmar, Margrave of the Saxon Ostmark.
He inherited Orlamünde from his father in 1039 and Weimar from his brother William in 1062.
He was appointed by the Emperor Henry IV to succeed William in Meissen as well.
She gave him three daughters: When he died, she remarried to Dedi I of Lusatia, Otto's stepfather.
This article about a German margrave is a stub.