The specifically “naval” complement on board was drawn from the non-Romans in the empire. An inscription from the island of Cos (IGRR 1.843) illustrates the position on a typical warship in detail. It records A. Terentius Varro, the presbeutes or legatus in charge (in the First Mithridatic War of 84–82 bc), as “leading the whole fleet,” Eudamos (a Greek) as
nauarchos (navarch) in command of the squadron, and specifies the other officers as a
trierarchos, the captain, a
kybernetes (Lat. gubernator), the helmsman or pilot, a
keleustes (Lat. celeusta), the rowing officer, a
proreus (Lat. proreta), the officer in the bow, a
pentacontarchos, apparently a junior officer, an
iatros (Lat. medicus), a doctor, and at least 20
epibatae or marines. The inscription breaks off before the oarsmen, eretai (Lat. remiges) are mentioned (if in fact they were).