According to the biographer plutarch, what was the first instance of political violence in republican rome?

Plutarch was a Greek writer and biographer is recognized today for his historical contributions to the Classical period, some of his well-recognized, works include the Moralia and Parallel Lives. 

Plutarch marks the first true instance of political violence following the establishment of the Republic as the assassination of Tiberius Gracchus who served as Roman Consul. 

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