Some years after the visit of Plato, the two Nectanebos, more especially the second, devoted themselves with energetic ardour to the restoration of the ancient buildings of the country and to the construction of new ones, such as the temple at Philæ. Buildings signed with their name are to be found all over Egypt; but these simultaneous undertakings seem to betray a sense of vanishing power, an uncertainty of the morrow, a feverish activity seeking to deceive itself and to hide its own weakness. Nothing could be more precarious than the political conditions under which this activity was displayed. The independence of the country was maintained by the dearly bought services of Spartan and Athenian mercenaries. Twice already had Persia crushed Egyptian revolts, and she was, perhaps, but watching her opportunity to cast the hordes of Asia upon the unhappy country for a third time. Ill obeyed as he was, the "Great King" could always find troops to take part in the spoiling of a country whose riches had proved so inexhaustible. And if, by any remote chance, the Persians should fail in their enterprise, another and a graver danger would menace the Egyptian monarchy from the rapid growth of the Greek power in the Mediterranean. Since the period of the Persian wars, the language, the literature, the arts, the mythology of Greece, had spread with great rapidity; and the moment might be foreseen when a supremacy founded upon intellectual worth would be confirmed by military triumph and the creation of a vast Hellenic empire. The conquest of Egypt was begun by the Ionian soldiers and merchants who were introduced into the Nile valley by Psemethek; it was bloodlessly completed by the arms of Alexander. For three centuries the Egyptians had been accustomed to see the Greeks freely coming and going among them as merchants, as mercenary officers, as travellers eager for instruction. The latter posed as disciples before the priests of Memphis and Heliopolis, and freely expressed a warmth of admiration which could not fail to flatter the national vanity. The Greeks would be better masters than their rivals from Persia. From them the Egyptians would, at least, obtain good administration and complete freedom in the exercise of their religion in return for their taxes. The Greeks were clear-sighted enough to understand their own interests; they were too philosophical and large minded for any fanatical persecution of, or even hindrance to, the national religion; they were too much of connoisseurs to fail in respect to a form of civilization whose prodigious antiquity they divined, and before which the most eminent among them were ever inclined to bow, like youths before an old man, or a parvenu before the descendant of a long line of kings.