The Collaborative International Dictionary
Trierarch \Tri"er*arch\, n. [L. trierarchus, Gr. ?; ? a trireme + ? a leader, a chief.] (Gr. Antiq.)
The commander of a trireme.
At Athens, one who (singly, or jointly with other citizens) had to fit out a trireme for the public service.
Wikipedia
Trierarch (, triērarchos) was the title of officers who commanded a trireme (triēres) in the classical Greek world.
In Classical Athens, the title was associated with the trierarchy (τριηραρχία, triērarchia), one of the public offices or liturgies, which were filled by wealthy citizens for a year. As the name implies, the trierarch was responsible for the outfitting and crewing of a trireme, and for commanding it in battle. Trierarchs thus had to be men of considerable means, since the expenses incurred could run as high as a talent in the course of a year. By the 4th century BC, trierarchies in Athens were assumed by navy boards ( symmoriai), as the financial burden of the job had become too great.
Usage examples of "trierarch".
The four archers were grouped at the stern around the trierarch and helmsman, and would be bodyguards for them during combat.
The trierarch was clearly accustomed to being obeyed by those he encountered, and Wona did not necessarily respond well to such imperatives.
In any event, the trierarch was surely capable of making up his own mind.
Then she realized that the trierarch might have confided to the other officer that he had another woman in mind for himself, so the other would not be concerned about the chance of Ittai wanting to take Wona back.
One of Wona's, probably, purchased for her by the trierarch, now forgotten.
She would get permission from the proprietor, who surely did not have many trierarchs as patrons.