Grecian seas.'[31] The Turkish wars of Venice lasted a long time. In that which ended in 1503 the decline of the Venetians' naval power was obvious. 'The Mussulmans had made progress in naval discipline; the Venetian fleet could no longer cope with theirs.' Henceforward it was as an allied contingent of other navies that that of Venice was regarded as important. Dyer[32] quotes a striking passage from a letter of Æneas Sylvius, afterwards Pope Pius II, in which the writer affirms that, if the Venetians are defeated, Christendom will not control the sea any longer; for neither the Catalans nor the Genoese, without the Venetians, are equal to the Turks. [Footnote 30: _Maritime_Wars_of_the_Turks_, Mitchell's trans., p. 12.] [Footnote 31: Sismondi, p. 256.] [Footnote 32: _Hist._Europe_, i. p. 85.] SEA-POWER IN THE SIXTEENTH AND SEVENTEENTH CENTURIES The last-named people, indeed, exemplified once more the rule that a military state expanding to the sea and absorbing older maritime populations becomes a serious menace to its neighbours. Even in the fifteenth century Mohammed II had made an attack on Southern Italy; but his sea-power was not equal to the undertaking. Suleymân the Magnificent directed the Ottoman forces towards the West. With admirable strategic insight he conquered Rhodes, and thus freed himself from the danger of a hostile force on his flank. 'The centenary of the conquest of Constantinople was past, and the Turk had developed a great naval power besides annexing Egypt and Syria.'[33] The Turkish fleets, under such leaders as Khair-ad-din (Barbarossa), Piale, and Dragut, seemed to command the Mediterranean including its western basin; but the repulse at Malta in 1565 was a serious check, and the defeat at Lepanto in 1571 virtually put an end to the prospect of Turkish maritime dominion. The predominance of Portugal in the Indian Ocean in the early part of the sixteenth century had seriously diminished the Ottoman resources. The wealth derived from the trade in that ocean, the Persian Gulf, and the Red Sea, had supplied the Mohammedans with the sinews of war, and had enabled them to contend with success against the Christians in Europe. 'The main artery had been cut when the Portuguese took up the challenge of the Mohammedan merchants of Calicut, and swept their ships from the ocean.'[34] The sea-power of Portugal wisely employed had exercised a great, though unperceived, influence. Though enfeebled and diminishing, the Turkish navy was still able to act with some effect in the seventeenth century. Nevertheless, the sea-power of the Turks ceased to count as a factor of importance in the relations between great states. [Footnote 33: Seeley, _British_Policy_, i. p. 143.] [Footnote 34: Whiteway, p. 2.]