Lothair was in conflict with Adelbert, Bishop of Bremen, over jurisdiction of the county and, in 1053, killed his cousin Ekbert of Elsdorf-Stade, inheriting his land.
After Lothair Udo’s death, his son took vengeance on those who participated in his senseless murder, including his half-brother Ekbert.
Otto, the instigator of Lothair Udo's murder, was killed in a battle near Hausneindorf in the summer of 1058.
Genealogie, politische Stellung, Comitat und Allodialbesitz der sächsischen Udonen; Diss.
Kiel, Stade mit umfassenden Nachweisen der Quellen und älteren Literatur, 1956