The tribunate of the plebs was constitutionally the strangest office Rome created: a position with enormous negative power and almost no positive authority, held by men who were personally inviolable and therefore theoretically untouchable, which the Senate solved, when necessary, by murdering them. The office existed because the plebeian class had successfully used the threat of mass withdrawal from Roman civic life to extract political concessions from the patrician establishment. It functioned for centuries as a genuine check on senatorial power. It became, in the hands of the Gracchi, the mechanism by which the Roman Republic began to destroy itself.