At home, the Republic similarly experienced a long streak of social and political crises, which ended in several violent civil wars. At first, the Conflict of the Orders opposed the patricians, the closed oligarchic elite, to the far more numerous "plebs", who finally achieved political equality in several steps during the 4th century BC. Later, the vast conquests of the Republic disrupted its society, as the immense influx of slaves they brought enriched the aristocracy, but ruined the peasantry and urban workers. In order to address this issue, several social reformers, known as the "Populares", tried to pass agrarian laws, but the Gracchi brothers, Saturninus, or Clodius Pulcher were all murdered by their opponents, the "Optimates", keepers of the traditional aristocratic order. Mass slavery also caused three Servile Wars; the last of them was led by Spartacus, a skilful gladiator who ravaged Italy and left Rome powerless until his defeat in 71 BC. In this context, the last decades of the Republic were marked by the rise of great generals, who exploited their military conquests and the factional situation in Rome to gain control of the political system. Marius (between 105 and 86 BC), then Sulla (between 82 and 78 BC) dominated in turn the Republic; both used extraordinary powers to purge their opponents. These multiple tensions led to a series of civil wars; the first between the two generals Julius Caesar and Pompey. Despite his victory and appointment as dictator for life, Caesar was slain in 44 BC. Caesar's heir Octavian and lieutenant Mark Antony defeated Caesar's assassins Brutus and Cassius in 42 BC, but then turned against each other. The final defeat of Mark Antony alongside his ally and lover Cleopatra at the Battle of Actium in 31 BC, and the Senate's grant of extraordinary powers to Octavian as "Augustus" in 27 BC – which effectively made him the first Roman emperor – thus ended the Republic.