The Grecian settlements in the distant countries of Gaul and Spain were not numerous. The most celebrated was Massalia, the modern Marseilles, founded by the Ionic Phocaeans in B.C. 600. 3. The northern coast of Africa, between the territories of Carthage and Egypt, was also occupied by Greek colonists. The city of Cyrene was founded about B.C. 630. It was a colony from the island of Thera in the AEgean, which was itself a colony from Sparta. The situation of Cyrene was well chosen. It stood on the edge of a range of hills, at the distance of ten miles from the Mediterranean, of which it commanded a fine view. These hills descended by a succession of terraces to the port of the town, called Apollonia. The climate was most salubrious, and the soil was distinguished by extraordinary fertility. With these advantages Cyrene rapidly grew in wealth and power; and its greatness is attested by the immense remains which still mark its desolate site. Cyrene planted several colonies in the adjoining district, of which Barca, founded about B.C. 560, was the most important. 4. There were several Grecian colonies situated on the eastern side of the Ionian sea, in Epirus and its immediate neighbourhood. Of these the island of Corcyra, now called Corfu, was the most wealthy and powerful. It was founded by the Corinthians about B.C. 700, and in consequence of its commercial activity it soon became a formidable rival to the mother-city. Hence a war broke out between these two states at an early period; and the most ancient naval battle on record was the one fought between their fleets in B.C. 664. The dissensions between the mother-city and her colony are frequently mentioned in Grecian history, and were one of the immediate causes of the Peloponnesian war. Notwithstanding their quarrels they joined in planting four Grecian colonies upon the same line of coast--Leucas, Anactorium, Apollonia, and Epidamnus. The colonies in Macedonia and Thrace were very numerous, and extended all along the coast of the AEgean, of the Hellespont, of the Propontis, and of the Euxine, from the borders of Thessaly to the mouth of the Danube. Of these we can only glance at the most important. The colonies on the coast of Macedonia were chiefly founded by Chalcis and Eretria in Euboea; and the peninsula of Chalcidice, with its three projecting headlands, was covered with their settlements, and derived its name from the former city. The Corinthians likewise planted a few colonies on this coast, of which Potidaea, on the narrow isthmus of Pallene, most deserves mention. Of the colonies in Thrace, the most flourishing were Selymbria and Byzantium, both founded by the Megarians, who appear as an enterprising maritime people at an early period. CHAPTER VII. THE PERSIAN WARS.--FROM THE IONIC REVOLT TO THE BATTLE OF MARATHON, B.C. 500-490.