A fertile source of dispute between states is the acquisition of territory beyond sea. As others have done before and since, the maritime republics of Italy quarrelled over this. Sea-power seemed, like Saturn, to devour its own children. In 1284, in a great sea-fight off Meloria, the Pisans were defeated by the Genoese with heavy loss, which, as Sismondi states, 'ruined the maritime power' of the former. From that time Genoa, transferring her activity to the Levant, became the rival of Venice, The fleets of the two cities in 1298 met near Cyprus in an encounter, said to be accidental, that began 'a terrible war which for seven years stained the Mediterranean with blood and consumed immense wealth.' In the next century the two republics, 'irritated by commercial quarrels'--like the English and Dutch afterwards--were again at war in the Levant. Sometimes one side, sometimes the other was victorious; but the contest was exhausting to both, and especially to Venice. Within a quarter of a century they were at war again. Hostilities lasted till the Genoese met with the crushing defeat of Chioggia. 'From this time,' says Hallam, 'Genoa never commanded the ocean with such navies as before; her commerce gradually went into decay; and the fifteenth century, the most splendid in the annals of Venice, is till recent times the most ignominious in those of Genoa.' Venice seemed now to have no naval rival, and had no fear that anyone could forbid the ceremony in which the Doge, standing in the bows of the _Bucentaur_, cast a ring into the Adriatic with the words, _Desponsamus_te,_Mare,_in_signum_veri_perpetuique_dominii_. The result of the combats at Chioggia, though fatal to it in the long-run, did not at once destroy the naval importance of Genoa. A remarkable characteristic of sea-power is the delusive manner in which it appears to revive after a great defeat. The Persian navy occasionally made a brave show afterwards; but in reality it had received at Salamis a mortal wound. Athens seemed strong enough on the sea after the catastrophe of Syracuse; but, as already stated, her naval power had been given there a check from which it never completely recovered. The navy of Carthage had had similar experience; and, in later ages, the power of the Turks was broken at Lepanto and that of Spain at Gravelines notwithstanding deceptive appearances afterwards. Venice was soon confronted on the sea by a new rival. The Turkish naval historian, Haji Khalifeh,[30] tells us that, 'After the taking of Constantinople, when they [the Ottomans] spread their conquests over land and sea, it became necessary to build ships and make armaments in order to subdue the fortresses and castles on the Rumelian and Anatolian shores, and in the islands of the Mediterranean.' Mohammed II established a great naval arsenal at Constantinople. In 1470 the Turks, 'for the first time, equipped a fleet with which they drove that of the Venetians out of the