Gnaeus Pompeius Magnus (Pompey the Great) was born in 106 BC in the northern Italian town of Picenum. Though not a native Roman family, the Pompeys were moderately successful at making inroads into Senate seats. His father, Pompey Strabo, was elected consul in 89 BC, and was an accomplished general who served Rome in the Marsic Social War, as well as the civil wars of Marius and Sulla. By the age of 17, Pompey was an active participant in his father's campaigns and was busily building a foundation for his own military career.
Pompey rose to prominence serving Sulla in the first major Roman civil war, defeating the forces of Marius in Africa. For this he earned, or was mocked with, the title Magnus (the Great). Involved only a short time in Roman civil affairs, Pompey quickly learned the political power of an army behind him. After Sulla, and despite having no experience as a Roman magistrate, he coerced a command in Spain against the rebel Sertorius, simply through the fear of his legions. While the war was not exactly a clear cut victory for Pompey, the opposing army was only defeated after Sertorius was murdered, Pompey returned to Rome in triumph.
Upon returning from Spain, Pompey helped mop up the war with the Gladiator general Spartacus, claiming much of the credit in the process. He and M. Licinius Crassus, who conducted the bulk of the operation against Spartacus, built a dangerous rivalry in the process. In order to avoid more potential civil disorder, as both men maintained considerable armies, both were elected as Consul for the year 70 BC. In their joint consulship, the two worked together repealing the bulk of Sulla's constitutional reforms, but otherwise had little use for one another.