 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.In the Saxon Rebellion of 1073–75, Thimo fought against King Henry IV and also quarreled with his brother Bishop Frederick of Münster.