Minden Cathedral

Minden Cathedral, dedicated to Saints Gorgonius and Peter, is a Roman Catholic church in the city of Minden, North Rhine-Westphalia, Germany. From the year 803 AD, when the area was conquered by Charlemagne, it was the center of a diocese and subsequently became the center of a small sovereign state, a prince-bishopric of Minden, until the time of the Peace of Westphalia, when Minden was secularized as the Principality of Minden. Today the church belongs to the diocese of Paderborn.

Source: Wikipedia