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In page Augsburg:

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Augsburg was granted the status of a Free Imperial City on 9 March 1276 and from then until 1803, it was independent of its former overlord, the Prince-Bishop of Augsburg. Frictions between the city-state and the prince-bishops were to remain frequent however, particularly after Augsburg became Protestant and curtailed the rights and freedoms of Catholics. With its strategic location at an intersection of trade routes to Italy, the Free Imperial City of Augsburg became a major trading centre.[citation needed]