abstract:Gaius Sempronius Gracchus (154 BC – 121 BC) was a Roman Popularis politician in the 2nd century BC and brother of the ill-fated reformer Tiberius Sempronius Gracchus. His election to the office of tribune in the years 123 BC and 122 BC and reformative policies while in office prompted a constitutional crisis and his death at the hands of the Roman Senate in 121 BC.