The Genoese had at first been the allies of the Pisans, and united with them to drive the Saracens out of several important islands. They also ravaged the coast of Northern Africa in the eleventh century, and, taking part in the first Crusade, obtained settlements on the shore of Palestine, particularly at Acre. Owing to their secure position at home and their foothold in the East and the islands of the West, their city became one of the two great maritime powers of Italy and the only noteworthy rival of Venice. The power of the Genoese and Venetians was immensely increased by the Crusades, and at one time so feared were they in the Levant that they were able to draw pensions and exact tribute from the pusillanimous emperor at Constantinople. The Venetians were especially favored by Alexius Comnenus, through whom they acquired convenient establishments along the Bosphorus and at Durazzo in Albania. Their doge was honored with the pompous title of _Protosebaste_. In the meanwhile intestine disturbances and wars with neighboring republics had reduced several of those cities which had lately been most flourishing, and none could compete successfully in the fourteenth century with Venice and Genoa, to which the foreign trade of Italy was left, and to whose marts the produce of the Levant and the countries bordering on the lower Mediterranean was brought, and either there or at the great cities of the interior exchanged for domestic manufactures and the industries of Central and Northern Europe. The carrying trade was almost exclusively their own, but the home or inland business was shared by many other cities—principally by Bologna, Ferrara, Florence, Lucca, and Milan. At that period the Atlantic ocean and northern coasts of Europe were but rarely navigated by Italian merchants. The Venetians alone despatched annually a large fleet, which—taking its name, the Flanders fleet, from its destination—carried on an enterprising and lucrative traffic with the Low Countries, and, in connection with the Hanseatic League or directly, spread over England, Scotland, and the nations lying on the North Sea and the Baltic, the spices, gums, silks, pearls, diamonds, and numerous other articles of oriental origin which they had procured from the Levant and further Indies. The Genoese furnished the same things to the French, Spaniards, and Moors of Andalusia; but Portugal was served by their rivals. A maritime power had risen before this time which disputed with the Genoese and Venetians the ascendency on the Mediterranean. This was Barcelona, whose sailors were among the best on the sea, and whose merchants were largely engaged in commerce. Many bold encounters took place between the Catalans and Italians, through jealousies of trade, but the former finally succumbed.