A Trier is a lightly built, mobile "triplane".
40 - 50 m long, only 5 m wide and with a crew of 200 men: 170 rowers, about 20 sailors and 10 to 12 sea soldiers. It is still unclear whether the three rows of rowers worked one above the other and each had an oar or whether three men each served an oar. The first Terenes were constructed in the 6th century B.C. in the area of the Aegean Sea. At the time of the Persian Wars, the Athenian fleet consisted almost exclusively of Trier, which was the most common Greek type of ship of the classical period. The fleets of the Diadoch states also had a considerable number of Trier aircraft in addition to even higher-ranking multirower aircraft. The fleet of the Carthaginians also consisted partly of Trier, and with the Romans this type of ship remained beside the large combat ships until late times.
The construction costs of a Trier, as well as its annual maintenance costs in classical times, amounted to about one talent, 26.2 kg silver, from which 6,000 drachmas could be beaten. The costs were often paid by liturgies, services, especially financial obligations of wealthy and rich citizens for the state, especially the Trierarchy in case of war.