 Thimo was a younger son of Margrave Theodoric II, Margrave of Lower Lusatia and his wife Mathilda, a daughter of Margrave Eckard I of Meissen.When his father was killed in 1034, Thimo succeeded him in his Wettin and Brehna home territories.He also served as "Vogt" (bailiff) of the Naumburg diocese and of the Wettin family monastery in Gerbstedt.