The Quadrireme was a ship that was likely to have been used by the Romans, but it is not known or proven. The root of Quadrireme "Quad" did not refer to the rows of oars on each side, like the Greek Trireme, but to the four men to each oar on the ship. The Quadrireme would therefore have to be a very broad vessel and it is considered relatively unlikely. The Quadrireme in the game is a powerful ship, but a slow sailor, better to draw it into a trap than engage it in the open sea.