The Greek essayist Plutarch describes Spartacus as "a Thracian of Nomadic stock", in a possible reference to the Maedi tribe. Appian says he was "a Thracian by birth, who had once served as a soldier with the Romans, but had since been a prisoner and sold for a gladiator".

Florus described him as one "who, from a Thracian mercenary, had become a Roman soldier, that had deserted and became enslaved, and afterward, from consideration of his strength, a gladiator". The authors refer to the Thracian tribe of the Maedi, which occupied the area on the southwestern fringes of Thrace, along its border with the Roman province of Macedonia – present day south-western Bulgaria. Plutarch also writes that Spartacus's wife, a prophetess of the Maedi tribe, was enslaved with him.

The name Spartacus is otherwise manifested in the Black Sea region. Five out of twenty Kings of the Thracian Spartocid dynasty of the Cimmerian Bosporus and Pontus are known to have borne it, and a Thracian "Sparta" "Spardacus" or "Sparadokos", father of Seuthes I of the Odrysae, is also known.

One modern author estimates that Spartacus was c. 30 years old at the time he started his revolt, which would put his birth year c. 103 BC.

According to the differing sources and their interpretation, Spartacus was a captive taken by the legions. Spartacus was trained at the gladiatorial school (ludus) near Capua belonging to Lentulus Batiatus. He was a heavyweight gladiator called a murmillo. These fighters carried a large oblong shield (scutum), and used a sword with a broad, straight blade (gladius), about 18 inches long. In 73 BC, Spartacus was among a group of gladiators plotting an escape.

About 70 slaves were part of the plot. Though few in number, they seized kitchen utensils, fought their way free from the school, and seized several wagons of gladiatorial weapons and armour. The escaped slaves defeated soldiers sent after them, plundered the region surrounding Capua, recruited many other slaves into their ranks, and eventually retired to a more defensible position on Mount Vesuvius.

Once free, the escaped gladiators chose Spartacus and two Gallic slaves—Crixus and Oenomaus—as their leaders. Although Roman authors assumed that the escaped slaves were a homogeneous group with Spartacus as their leader, they may have projected their own hierarchical view of military leadership onto the spontaneous organization, reducing other slave leaders to subordinate positions in their accounts.

The response of the Romans was hampered by the absence of the Roman legions, which were engaged in fighting a revolt in Hispania and the Third Mithridatic War. Furthermore, the Romans considered the rebellion more of a policing matter than a war. Rome dispatched militia under the command of the praetor Gaius Claudius Glaber, who besieged Spartacus and his camp on Mount Vesuvius, hoping that starvation would force Spartacus to surrender. They were taken by surprise when Spartacus used ropes made from vines to climb down the steep side of the volcano with his men and attacked the unfortified Roman camp in the rear, killing most of the militia.

The rebels also defeated a second expedition against them, nearly capturing the praetor commander, killing his lieutenants, and seizing the military equipment. Due to these successes, more and more slaves flocked to the Spartacan forces, as did many of the herdsmen and shepherds of the region, swelling their ranks to some 70,000. At its height, Spartacus's army included many different peoples, including Celts, Gauls, and others. Due to the previous Social War (91–87 BC), some of Spartacus's ranks were legion veterans. Of the slaves that joined Spartacus ranks, many were from the countryside. Rural slaves lived a life that better prepared them to fight in Spartacus's army. In contrast, urban slaves were more used to city life and were considered "privileged" and "lazy."

In these altercations, Spartacus proved to be an excellent tactician, suggesting that he may have had previous military experience. Though the rebels lacked military training, they displayed skilful use of available local materials and unusual tactics against the disciplined Roman armies. They spent the winter of 73–72 BC training, arming and equipping their new recruits, and expanding their raiding territory to include the towns of Nola, Nuceria, Thurii, and Metapontum. The distance between these locations and the subsequent events indicate that the slaves operated in two groups commanded by Spartacus and Crixus.

In the spring of 72 BC, the rebels left their winter encampments and began to move northward. At the same time, the Roman Senate, alarmed by the defeat of the praetorian forces, dispatched a pair of consular legions under the command of Lucius Gellius and Gnaeus Cornelius Lentulus Clodianus. The two legions were initially successful—defeating a group of 30,000 rebels commanded by Crixus near Mount Garganus —but then were defeated by Spartacus. These defeats are depicted in divergent ways by the two most comprehensive (extant) histories of the war by Appian and Plutarch.

Alarmed at the continued threat posed by the slaves, the Sen…

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