Among the extant Lives of Plutarch there are thirteen Lives of Romans which belong to the most eventful period of Roman history. They are the lives of the brothers Tiberius and Caius Sempronius Gracchus, of Caius Marius, Lucius Cornelius Sulla, Quintus Sertorius, Marcus Licinius Crassus, Cneius Pompeius Magnus, Marcus Porcius Cato the Younger, Marcus Tullius Cicero, Lucius Licinius Lucullus, Caius Julius Caesar, Marcus Junius Brutus, and Marcus Antonius. From the year of the death of Tiberius Gracchus, B.C. 133, to the death of Marcus Antonius, B.C. 30, a period of about one hundred years, the Roman State was convulsed by revolutions which grew out of the contest between the People and the Nobility, or rather, out of the contests between the leaders of these two bodies. This period is the subject of Appian's History of the Civil Wars of the Romans, in Five Books. Appian begins with the Tribunate and legislation of Tiberius Gracchus, from which he proceeds to the Dictatorship of Sulla, and then to the quarrels between Pompeius and Caesar, and Caesar's Dictatorship and assassination. He then proceeds to the history of the Triumvirate formed after Caesar's death by his great nephew Caius Julius Caesar Octavianus, Marcus Antonius, and Lepidus, the quarrels of the Triumviri, the downfall of Lepidus, who was reduced to the condition of a private person, and the death of Sextus Pompeius, the last support of the party in whose cause his father, Cneius Pompeius, lost his life.