Romulus and Remus, known as The Killers of Carthage, are famous gladiators who compete in a team, and are two of Basillius' champions.
Their names are derived from the brothers Romulus and Remus of Roman Mythology. Weather or not they are actually brothers, or are simply using "stage names" is unknown.
Romules and Remus appear together for the only time in Chapter 7. During a qualifying tournament Basilius is holding to determine admission to his brother's greater tournament, the two champions are sent in to face Maris Titus, disguised as Damocles, and are immediately slain, earning Marius' admission.