|First appearance||S2E01: Fugitivus|
|Last appearance||S2E04: Empty Hands|
|Relationships|| Gaius Claudius Glaber (Praetor/Friend, deceased)|
Salvius (Comrade, deceased)
|Status||Deceased (Stabbed by Spartacus and Killed by Ashur)|
Marcus is the Military Tribune of Gaius Claudius Glaber.
Marcus is young, but wise, often providing counsel and tactical advice to Glaber. Marcus is no hulking man, but he is brave and has some fighting skill. He is adorned in common-clothing that would be attributed to his status and wears a set of Roman armor when involved in military movements.
Marcus is both intelligent and collective, being calm in heated situations and serving as a strategic battle-commander. It is hinted that he and Glaber are close friends, as when his corpse was taken back to Capua, Glaber was very upset by the loss of his loyal tribune and closest adviser.
A trained Roman soldier and a capable leader in his own right, Marcus has combat experience. While he is able to hold his own against an average gladiator, he pales in comparison to a high-tier fighter such as Spartacus, whom is easily able to best him on two ocassions.
His first appearance is in Rome, when he is conversing with Glaber about the two of them climbing the political ladder together. When Glaber is called to Capua to defeat Spartacus' rebellion, Marcus is quick to accompany him as his Military Tribune.
When they arrive in Capua, Glaber and Marcus set up camp in the ruined House of Batiatus. Lucretia is then found by Ilithyia, Marcus proposes that they use Lucretia as a "sign of the gods" that Glaber will crush Spartacus, due to the fact that she alone had survived the slave uprising at the House of Batiatus. When Spartacus later attacks Glaber in the square, Marcus is quick to defend him. The two fight Spartacus, but are soundly defeated. Marcus is seen with Glaber discussing what the next move should be against Spartacus.
With the aid of the slave, Ashur, Marcus leads a contingement of Roman soldiers to the mines to capture Spartacus and his rebels. Their ambush results in the death of several rebels (including Mannus and Plenus) and the capture of Crixus, Rhaskos and Acer.
Marcus and his men pursue Spartacus and the escaping rebels into the woods, where Marcus is warned by Ashur that he would have a better chance of catching Spartacus if the soldiers did not split up and stuck together. Marcus shrugs off his warnings, boasting that Spartacus will fall before the legions of Glaber, and - after several more skirmishes - his men are soon responsible for the deaths of more fleeing rebels: Tychos Sophus and Fortis, though not without suffering several casualties.
Confronting the surviving rebels in an ambush, Ashur kills the rebel gladiator Liscus, while Marcus and Spartacus square off. Spartacus proves to be the superior warrior and Marcus is severely injured, surviving only because Ashur drags him off the battlefield.After dragging him to a secluded area, Ashur begs the severely injured Marcus to sound a retreat with the remainder of his life. Marcus states to Ashur that his legion will never retreat and will fight to the last man if they must. Ashur replies saying "I am not a Roman" and murders Marcus in cold blood, before sounding the retreat.
Marcus' body is later taken back to Capua, where Glaber mourns his death and holds Ashur to blame.