Though the Persians were not themselves a nautical people, they were quite aware of the great importance of a navy, and spared no pains to provide themselves with an efficient one. The conquests of Phoenicia, Cyprus, Egypt, and the Greek islands were undertaken, it is probable, mainly with this object; and these parts of the Empire were always valued chiefly as possessing skilled seamen, vessels, and dockyards, from which the Great King could draw an almost inexhaustible supply of war-ships and transports. Persia at times had the complete command of the Mediterranean Sea, and bore undisputed sway in the Levant during almost the whole period of her existence as an empire. The war-ship preferred by the best naval powers during the whole period of the Persian rule was the trireme, or decked galley impelled by rowers sitting in three tiers, or banks, one above another. This vessel, the invention of the Corinthians, had been generally adopted by the nations bordering on the Mediterranean in the interval between B.C. 700 and B.C. 525, when by the reduction of Phoenicia, Cyprus, and Egypt, the Persians obtained the command of the sea. Notwithstanding the invention of quadriremes by the Carthaginians before B.C. 400, and of quinqueremes by Dionysius the Elder soon after, the trireme stood its ground, and from first to last the Persian fleets were mainly composed of this class of vessels. The trireme was a vessel of a considerable size, and was capable of accommodating two hundred and thirty persons. Of these, two hundred constituted the crew, while the remaining thirty were men-at-arms, corresponding to our own “marines.” By far the greater number of the crew consisted of the rowers, who probably formed at least nine-tenths of the whole, or one hundred and eighty out of the two hundred. The rowers sat, not on benches running right across the vessel, but on small seats attached to its side. They were arranged, as before stated, in three tiers, not, however, directly one over the head of another, but obliquely, each at once above and behind his fellow. Each rower had the sole management of a single oar, which he worked through a hole pierced in the side of the vessel. To prevent his oar from slipping he had a leathern strap, which he twisted round it, and fastened to the thole, probably by means of a button. The remainder of the crew comprised the captain, the steersman, the petty officers, and the sailors proper, or those whose office it was to trim the sails and look to the rigging. The trireme of Persian times had, in all cases, a mast, and at least one sail, which was of a square shape, hung across the mast by means of a yard or spar, like the “square-sail” of a modern vessel. The rudder was composed of two broad-bladed oars, one on either side of the stern, united, however, by a cross-bar, and managed by a single steersman. The central part of a trireme was always decked, and on this deck, which