In very ancient times the cables were made of leather thongs, afterwards of rushes, the osier, the Egyptian byblus, and other materials. The Veneti used iron cables; hence we see that what is generally deemed an invention entirely modern, was known to a savage nation in Gaul, in the time of Caesar. This nation was so celebrated for the building and equipment of their vessels, which were, from all accounts, better able to withstand the fury of the ocean than the ships even of the Greeks and Romans, that Caesar gave orders for the building of vessels, on the Loire, similar to those of the Veneti, large, flat-bottomed, and high at the head and stern. Yet these vessels, built on such an excellent model, and supplied with chain-cables, had no sails but what were made of leather; and these sails were never furled, but only bound to the mast. Besides cables, the ancients had other ropes to fasten ships in the harbours: the usual mode was to erect stones for this purpose, which were bored through. In the time of Homer, the ships of the ancients had only one bank of oars; afterwards two, three, four, five, and even nine and ten banks of oars are said not to have been uncommon: but it is not easy to understand in what manner so many oars could have been used: we shall not enter on this question, which is still unresolved. The Romans had seldom any vessels with more than five banks of oars. Such vessels as were intended for lightness, had only one bank of oars; this was particularly the case with the vessels of the Liburnians, a piratical tribe on the Adriatic. The sails, in very ancient times, were made of leather; afterwards of rushes. In the days of Agricola, the Roman sails were made of flax: towards the end of the first century, hemp was in common use among them for sails, ropes, and new for hunting. At first there was only one sail in a ship, but afterwards there appear to have been several: they were usually white, as this colour was deemed fortunate; sometimes, however, they were coloured. At the time of the Trojan war, the Greek ships had only one mast, which was lowered upon the deck when the ship was in harbour: near the top of the mast a ribband was fastened to point out the direction of the wind. In later times there seem to have been several masts, though this is denied by some authors. It remains now to speak of the materials of which the ships were built, their size, and their crews.