Peace negotiations took place in Osnabrück and the nearby city of Münster from 1643 to 1648. The twin Treaties of Osnabrück and Münster, collectively known as the Peace of Westphalia, ended the Thirty Years' War. Osnabrück was officially recognized as bi-confessional Catholic and Lutheran. The prince-bishopric would be held alternately by a Catholic bishop and a Lutheran bishop. The Protestant bishop would be selected from the descendants of the Dukes of Brunswick-Lüneburg, with priority given to the cadets of what became the House of Hanover. From 1667, prince-bishop Ernest Augustus, Duke of Brunswick-Lüneburg, built the new baroque palace. His son, George I of Great Britain, died in the palace, at the time residence of his younger brother, prince-bishop Ernest Augustus, Duke of York and Albany, on a travel on 11 June 1727.
