The power base of his family lay around Harsefeld and Stade, but through advantageous marriages, they had control of almost the entire eastern third of the Duchy of Saxony in lands and rights.
Adalbert had won great influence over the young King Henry IV and he designed to extend the influence of the Archdiocese of Hamburg-Bremen over the various small counties of Saxony, especially between the Elbe and the Weser in order to better evangelise the Slavs.
After Henry IV came of age in 1065, Lothair recovered his lost territories from the Billung and Adalbert, whose took a serious setback (1066).
In 1073, he was on the side of the king, but the policy of Adalbert and his successor Liemar put him at odds with the royal party again.
1050), their children were: Lothair Udo was succeeded as margrave and count by his son Henry upon his death.