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How far did the Thuringian kingdom extend around the year 500?

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Around the year 500, the Germanic Thuringians had established a large kingdom that extended from the Harz mountains in the north to the Danube in the south.1

This kingdom was later reduced following the defeat of the Thuringian king, Irminfrid, by the Frankish kings Theodoric I and Chlotar I at the Battle of Burgscheidungen in 531. After this defeat, the territory was restricted to the region of the Harz mountains and the Thuringian Forest and was subsequently governed by Frankish dukes.1