|First appearance||S2E05: Libertus|
|Last appearance||S2E05: Libertus|
|Status||Deceased (Killed by Spartacus)|
Masonius, like many gladiators, revels in the glory of fighting in the arena. He has fierce skill and a dangerous fighting style. He also holds honor in high regard, expressing having had long desire to fight beside Gannicus, whom he considers to be the best champion to ever enter the arena.
Masonius is pitted against Strabo in a match. It is a close fight, but Masonius is the victor, killing Strabo with a sword thrust to the back of his neck.
He expresses great honor of being able to fight alongside Gannicus upon the sands.
He is later killed by Spartacus during combat, with a trident of another fallen gladiator.