less in need, and when the purple-fish of their own coasts were no longer sufficient for their extensive dyeing, colouring-matter had to be obtained. Large quantities of these fish produced a proportionately small amount of the dye. Copper-ore was found in Cyprus, gold in the island of Thasos, and purple-fish on the coasts of Hellas. When the fall of the kingdom of the Hittites and the overthrow of the Amorite princes in the south of Canaan augmented the numbers of the population on the coast, these cities were no longer content to obtain those possessions of the islands by merely landing and making exchanges with the inhabitants. Intercourse with semi-barbarous tribes must be protected by the sword. Good harbours were needed where the ships could be sheltered from storm and bad weather, where the crews could find safety from the natives, rest and fresh stores of water and provisions. Thus arose protecting forts on the distant islands and coasts, which received the ships of the native land. Under the protection of these intercourse could be carried on with the natives, and they were points of support for the collection of the fish and the sinking of mines. In order to obtain the raw material necessary for their industry no less than to carry off the surplus of population, the Phenicians were brought to colonise Cyprus, Rhodes, Crete, Thera, Melos, Oliarus, Samothrace, Imbros, Lemnos and Thasos. In the bays of Laconia and Argos, in the straits of Euboea,[130] purple-fish were found in extraordinary quantities. The Phenicians settled in the island of Cythera in the bay of Laconia, which, as Aristotle says, was once called Porphyrussa from its purple-fish,[131] and there erected that ancient temple to the oriental Aphrodite, Aphrodite in armour, just as in Attica in the deme of Athmonon they founded the temple of the Syrian Aphrodite and excavated the tombs on Hymettus.[132] Midway between the straits of Euboea and the bay of Corinth, which abounded with purple-fish, rose the strong fortress of the Cadmeia, and on Acrocorinthus the shrine of Ashera.