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What if the coalition of Germanic tribes that destroyed the 17th, 18th and 19th legion in the Battle of the Teutoburg Forest in 9 AD became the foundation of a Germanic Empire from the Rhine to the Ural and from the Danube to Scandinavia? And what if Arminius (who's Germanic name was perhaps Siegfried) became the first Kaiser of that empire?

EDIT: Ignore those borders!
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