Someone who was specially trained to fight a Retiarius, a type of gladiator that had a trident, or a net.

The very distinctive helmet of the Secutor had only two small eye-holes, in order to prevent a Retiarius's trident from being thrust through the face, as well as a rounded top, so as not to get caught in a net.

The Secutor had to be quick or he was in danger of falling from exhaustion or faint because of breath constrictions.

The Secutor wore a loincloth, and a wide belt (much like the Retiarius). On his right arm, he wore a manicae (a heavy linen wrapping tied with leather tongs), and on his left leg, he wore an ocrea (a greave made of boiled leather or metal). He also carried a scutum (a curved rectangular shield) to protect himself.