It will be obvious, from this description of the valley of the Nile, that it formed a country which was in ancient times isolated and secluded, in a very striking manner, from all the rest of the world. It was wholly shut in by deserts, on every side, by land; and the shoals, and sand-bars, and other dangers of navigation which marked the line of the coast, seemed to forbid approach by sea. Here it remained for many ages, under the rule of its own native ancient kings. Its population was peaceful and industrious. Its scholars were famed throughout the world for their learning, their science, and their philosophy. It was in these ages, before other nations had intruded upon its peaceful seclusion, that the Pyramids were built, and the enormous monoliths carved, and those vast temples reared whose ruined columns are now the wonder of mankind. During these remote ages, too, Egypt was, as now, the land of perpetual fertility and abundance. There would always be corn in Egypt, wherever else famine might rage. The neighboring nations and tribes in Arabia, Palestine, and Syria, found their way to it, accordingly, across the deserts on the eastern side, when driven by want, and thus opened a way of communication. At length the Persian monarchs, after extending their empire westward to the Mediterranean, found access by the same road to Pelusium, and thence overran and conquered the country. At last, about two hundred and fifty years before the time of Cleopatra, Alexander the Great, when he subverted the Persian empire, took possession of Egypt, and annexed it, among the other Persian provinces, to his own dominions. At the division of Alexander's empire, after his death, Egypt fell to one of his generals, named Ptolemy. Ptolemy made it his kingdom, and left it, at his death, to his heirs. A long line of sovereigns succeeded him, known in history as the dynasty of the Ptolemies--Greek princes, reigning over an Egyptian realm. Cleopatra was the daughter of the eleventh in the line.