they commanded was also reflected by the rank and the corresponding pay of the commanders. The prefects of the two praetorian fleets were ranked procuratores ducenarii, meaning they earned 200,000 sesterces annually, the prefects of the Classis Germanica, the Classis Britannica and later the Classis Pontica were centenarii (i.e. earning 100,000 sesterces), while the other fleet prefects were (i.e. they received 60,000 sesterces). Types of ships The generic Roman term for an oar-driven galley warship was "long ship" (Latin: navis longa, Greek: naus makra), as opposed to the sail-driven navis oneraria (from onus, oneris: burden), a merchant vessel, or the minor craft (navigia minora) like the scapha. 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. During the final confrontation between Octavian and Mark Antony, Octavian's fleet was composed of quinqueremes, together with some "sixes" and many triremes and liburnians, while Antony, who had the resources of Ptolemaic Egypt to draw upon, fielded a fleet also mostly composed of quinqueremes, but with a sizeable complement of heavier warships, ranging from "sixes" to "tens" (Gk. dekērēs). Later historical tradition made much of the prevalence of lighter and swifter vessels in Octavian's fleet, with Vegetius even explicitly ascribing Octavian's victory to the liburnians. This prominence of lighter craft in the historical narrative is perhaps best explained in light of subsequent developments. After Actium, the operational landscape had changed: for the remainder of the Principate, no opponent existed to challenge Roman naval hegemony, and no massed naval confrontation was likely. The tasks at hand for the Roman navy were now the policing of the Mediterranean waterways and the border rivers, suppression of piracy, and escort duties for the grain shipments to Rome and for imperial army expeditions. Lighter ships were far better suited to