““...Very well,” said Ischomachus, but as to that which is common to all pursuits, whether agricultural, or political, or domestic, or military, namely, that he who would excel in them must be capable of directing others, I entirely agree with you, Socrates, that some persons greatly excel others in judgment; 3. as we see in a galley,' continued he, 'when the crew are out at sea, and have to accomplish a certain distance in the course of the day, some of the celeustæ[2] can act and speak in such a manner as to excite the spirits of the men to voluntary exertion, while others are so dull that the rowers take more than double the time in performing the same course. The one party, as well the celeustes as those who are directed by him, go on shore covered with perspiration, and praising one another, while the other party arrive indeed unfatigued, but detesting their officer, and detested by him….”

[2] We have no English word for the K???vor?g in an ancient galley. He was the man who, by voice or signal, or both, gave time to the rowers. Virgil calls him hortator, Æn. iii. 128; and he was sometimes termed portisculus and pausarius. He was somewhat similar to the modern coxswain.”
[Xenophon's Minor Works, Watson ed., 1857]