The navy consisted of a wide variety of different classes of warships, from heavy polyremes to light raiding and scouting vessels. Unlike the rich Hellenistic Successor kingdoms in the East however, the Romans did not rely on heavy warships, with quinqueremes (Gk. "pentērēs"), and to a lesser extent quadriremes (Gk. "tetrērēs") and triremes (Gk. "triērēs") providing the mainstay of the Roman fleets from the Punic Wars to the end of the Civil Wars. The heaviest vessel mentioned in Roman fleets during this period was the hexareme, of which a few were used as flagships. Lighter vessels such as the liburnians and the hemiolia, both swift types invented by pirates, were also adopted as scouts and light transport vessels.