Gracchus Tiberius SemproniusGrac·chus
, Tiberius Sempronius c. 163–133 BC.
Roman social reformer. Known with his brother Gaius Sempronius Gracchus (c. 153–121 BC) as “the Gracchi,” he sought to aid poor farmers through greater subdivision of land but was killed in a riot. Gaius assumed his brother's work, initiating several reforms, and met a similar fate.