Duchy of Franconia
Having married Matilda of Germany (died 1025), a daughter of Emperor Otto II and his consort Theophanu, Ezzo became prominent during the reign of his brother-in-law, Emperor Otto III. The marriage was expressly consented by the Dowager Empress Theophanu, probably to rally the powerful family of Ezzo to the throne. Matilda received as dowry out of Ottonian possessions lands in Thuringia and in the Duchy of Franconia (Orlamünde and the East Franconian territories of Coburg and Salz), while her husband gave her as dowry the family estate of Brauweiler near Cologne.