Arminius was a powerful barbarian chief. At the Teutoburg Forest, he inflicted one of Rome's greatest ever defeats.

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https://en.wikipedia.org/wiki/Battle_of_the_Teutoburg_Forest#/media/File:Germanicus.jpg ChrisO CC BY SA 3.0
https://en.wikipedia.org/wiki/Battle_of_the_Teutoburg_Forest#/media/File:Germania_Enobarbo_e_Tiberio.jpg Cristiano4 CC BY SA 3.0