Ariovistus âr˝ēōvĭs´təs [key], fl. 58 BC, Germanic chieftain, leader of the Suebi. He crossed the Rhine c.71 BC, defeated the Aedui , and came to dominate much of Gaul (see Gallic Wars ). In 60 BC he was made a friend and ally of Rome, but his power threatened the Romans in Gaul, and Julius Caesar, soon after winning the great victory of Bibracte over the Helvetii, undertook a campaign against him. Caesar defeated Ariovistus somewhere in Upper Alsace in 58 BC

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