the Mediterranean region. Maritime classicist historian Lionel Casson used the example of Homer's works to show that seaborne raiding was considered a common and legitimate occupation among ancient maritime peoples. The later Athenian historian Thucydides described it as having been "without stigma" before his time. The development of the ram sometime before the 8th century BC changed the nature of naval warfare, which had until then been a matter of boarding and hand-to-hand fighting. With a heavy projection at the foot of the bow, sheathed with metal, usually bronze, a ship could incapacitate an enemy ship by punching a hole in its planking. The relative speed and nimbleness of ships became important, since a slower ship could be outmaneuvered and disabled by a faster one. The earliest designs had only one row of rowers that sat in undecked hulls, rowing against tholes, or oarports, that were placed directly along the railings. The practical upper limit for wooden constructions fast and maneuverable enough for warfare was around 25–30 oars per side. By adding another level of oars, a development that occurred no later than c. 750 BC, the galley could be made shorter with as many rowers, while making them strong enough to be effective ramming weapons. The emergence of more advanced states and intensified competition between them spurred on the development of advanced galleys with multiple banks of rowers. During the middle of the first millennium BC, the Mediterranean powers developed successively larger and more complex vessels, the most advanced being the classical trireme with up to 170 rowers. Triremes fought several important engagements in the naval battles of the Greco-Persian Wars (502–449 BC) and the Peloponnesian War (431–404 BC), including the Battle of Aegospotami in 405 BC, which sealed the defeat of Athens by Sparta and its allies. The trireme was an advanced ship that was expensive to build and to maintain due its large crew. By the 5th century, advanced war galleys had been developed that required sizable states with an advanced economy to build and maintain. It was associated with the latest in warship technology around the 4th century BC and could only be employed by an advanced state with an advanced economy and administration. They required considerable skill to row and oarsmen were mostly free citizens who had years of experience at the oar. Hellenistic era and rise of the Republic As civilizations around the Mediterranean