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In page Bamberg:

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The old Bishopric of Bamberg was composed of an unbroken territory extending from Schlüsselfeld in a northeasterly direction to the Franconian Forest, and possessed in addition estates in the Duchies of Carinthia and Salzburg, in the Nordgau (the present Upper Palatinate), in Thuringia, and on the Danube. By the changes resulting from the Reformation, the territory of this see was reduced by nearly one half in extent. Since 1279 the coat of arms of the city of Bamberg is known in the form of a seal.[citation needed]