Ariovistus fought against
Ariovistus fought against this man who was once captured by Cilcillian pirates and demanded a higher ransom for himself. His daughter, Julia, was used to secure a political alliance with a man who was given the cognomen Magnus by Sulla, and his defeat of Vercingetorix is detailed in his Commentarii de Bello Gallico. He led the 13th Legion across the Rubicon river, starting the Roman Civil War, which he fought against Pompey, a fellow member of the First Triumvirate.  Name this Roman "dictator in perpetuity" who was assassinated by Brutus on the Ides of March.
Ariovistus fought against this man who was once captured by Cilcillian pirates and demanded a higher ransom for himself.
Gaius Julius Caesar