Question: Gaius Cassius Longinus, was a Roman senator, a leading instigator of the plot to kill Julius Caesar, and the brother in-law of Marcus Junius Brutus, he commanded troops with Brutus during the Battle of Philippi against the combined forces of which Roman politician and general who played a critical role in the transformation of the Roman Republic from an oligarchy into the autocratic Roman Empire?
Sentence (from "Gaius Cassius Longinus"): Gaius Cassius Longinus (] ; October 3, before 85 BC – October 3, 42 BC) was a Roman senator, a leading instigator of the plot to kill Julius Caesar, and the brother in-law of Marcus Junius Brutus.
Relevant evidence: No