The one prince-bishopric the Peace of Westphalia left permanently bi-confessional: after 1648 a Catholic bishop and a Lutheran Welf prince held the throne in alternation.
Mediatized in 1803 to the Electorate of Hanover; the territory passed to Prussia in 1806, the Kingdom of Westphalia in 1807, Napoleonic France in 1810, and back to Hanover in 1814.
The Osnabrück congress and the treaty that fixed the see's unique Catholic/Lutheran alternation.
The imperial church, the Westphalian settlement and the 1803 mediatization.