Page "Duchy of Saxony" Paragraph 34

Otto and Bernard helped their second brother Siegfried, who since 1168 had called himself the Bishop Elect of Bremen, to gain the see of Bremen, with part of the diocesan territory being upgraded to form the Prince-Archbishopric of Bremen ().

Thus the Prince-Archbishopric of Bremen became-among many others-one of the successor states of the old Duchy of Saxony, holding only a small part of its former territory.