07 Extra The diocese The diocese of Chur has existed since the Early Middle Ages. The bishops of Chur were not only religious authorities but also feudal lords with considerable secular power. The size of the diocese is largely congruent with the borders of the historical Roman province of Raetia Prima. This means that the diocese of the time was considerably larger than the canton of Grisons is today. The map shows the historical diocese between the 5th century and 1816 (in German).Map: Raetian Museum +