The conquest of Phœnicia by the kings of Assyria and Chaldea had an effect on far-away Spain. The Phœnician settlements of the peninsula became independent, but they began to have ever more extensive relations with the great Phœnician colony of Carthage on the North African coast. This city is believed to have acquired the island of Ibiza in much earlier times, but it was not until the sixth century B.C. that the Carthaginians entered Spain in force. At that time the people of Cádiz are said to have been engaged in a dangerous war with certain native tribes, wherefore they invited the Carthaginians to help them. The latter came, and, as has so often occurred in history, took over for themselves the land which they had entered as allies. [Sidenote: The Greeks in Spain.] Meanwhile, the Greeks had already been in Spain for some years. Tradition places the first Greek voyage to the Spanish coast in the year 630 B.C. Thereafter there were commercial voyages by the Greeks to the peninsula, followed in time by the founding of settlements. The principal colonizers were the Phocians, proceeding from their base at Marseilles, where they had established themselves in the seventh century B.C. Their chief post in Spain was at Emporium (on the site of Castellón de Ampurias, in the province of Gerona, Catalonia), and they also had important colonies as far south as the Valencian coast and yet others in Andalusia, Portugal, Galicia, and Asturias. Their advance was resisted by the Phœnicians and their Carthaginian successors, who were able to confine the Greeks to the upper part of the eastern coast as the principal field of their operations. The Greek colonies were usually private ventures, bound to the city-states from which they had proceeded by ties of religion and affection alone. They were also independent of one another. Their manner of entry resembled that already described in the case of the Phœnicians, for they went first to the islands near the coast, and thence to the mainland, where at length they joined with native towns, although having a separate, walled-off district of their own,--comparable to the situation at the present day in certain ports of European nations on the coast of China. Once masters of the coast the Greeks were able to penetrate inland and to introduce Greek goods and Greek influences over a broad area of the peninsula. To them is attributed the introduction of the vine and the olive, which ever since have been an important factor in the economic history of Spain. [Sidenote: Spain under the Barcas.]