number of freight ships of any kind was infinitesimal compared with the enormous number of fighting craft that were built by the Mediterranean nations. And however much Greece and Rome laboured to develop the warlike galley, yet the evolution of the merchant ship was sadly neglected, partly, no doubt, because of the risks which a merchant ship ran and partly because the centuries of fighting evoked little encouragement for a ship of commerce.
During the centuries which followed the downfall of the Roman Empire it must not be supposed that the sea was bereft of pirates. As we have already seen, the decay of Rome was commensurate with the revival of piracy. But with the gradual spread of southern civilisation the importance of and the demand for commercial ships, as differentiated from fighting craft, increased to an unheard-of extent. No one requires to be reminded of the rise to great power of Venice and Genoa and Spain. They became great overseas traders within limits, and this postulated the ships in which goods could be carried. So it came to this that crossing and recrossing the Mediterranean there were more big-bellied ships full of richer cargoes and traversing the sea with greater regularity than ever had been in the history of the world. And as there will always be robbers when given the opportunity, either by sea or by land, irrespective of race or time, so when this amount of wealth was now afloat the sea-robber had every incentive to get rich quickly by a means that appealed in the strongest terms to an adventurous temperament.
In Italy the purely warlike ship had become so obsolete that, in the opinion of some authorities, it was not till about the middle of the ninth century that these began to be built, at any rate as regards that great maritime power, Venice. She had been too concerned with the production and
