an Entity references as follows:
Bremen-Verden, formally the Duchies of Bremen and Verden (German pronunciation: [ˈfɛɐ̯dən]; German: Herzogtümer Bremen und Verden), were two territories and immediate fiefs of the Holy Roman Empire, which emerged and gained imperial immediacy in 1180. By their original constitution they were prince-bishoprics of the Archdiocese of Bremen and Bishopric of Verden.