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For example, the formerly Catholic free imperial cities of Überlingen and Ravensburg had to accept Protestant citizens, and provide a place for Protestant worship; similarly, formerly Protestant cities as Schwäbisch Hall had to offer Catholics a place of religious worship.
It refers to the large number of virtually sovereign medium and small secular and ecclesiastical principalities and Free Imperial cities, some of which were little larger than a single town or the grounds of the monastery of an Imperial abbey.