Sextus is one of Captain Marcus' ex crew members.
Sextus was one of the sailors on Marcus's old ship, the Myrtilla, when it sunk. However, he survives and finds refuge in Rhodes. He is contacted by the slave-trader Magnus and offered money if he could stop Flavia Gemina, Marcus and the rest of the Delphina's (the name of Marcus' new ship) crew from stopping Magnus. Sextus agrees and then ties up Flavia, Jonathan ben Mordecai and Nubia on the Delphina. He plans to use it to sell them and the other kidnapped children around the Roman empire. However, he is caught and arrested by the vigiles.