The very year of the antiquary’s second visit to Athens witnessed the last attempt of a patriotic and ambitious Greek to recover all Greece for his race. The future Emperor Constantine was now Despot of Mistra, the mediæval Sparta; and he thought that the moment had at last come for renewing the plan for the annexation of the Athenian duchy which had failed nine years before. The Turks, hard pressed by the Hungarians and Poles, defeated by “the white knight of Wallachia” at Nish, defied by Skanderbeg in the mountains of Albania, and threatened by the appearance of a Venetian fleet in the Ægean, could no longer protect their creature at Athens. Ere long the last Constantine entered the gates of Thebes and forced Nerio II to pay him tribute. The Court of Naples heard that he had actually occupied Athens; and Alfonso V of Aragon, who had never forgotten that he was still titular Duke of Athens and Neopatras, wrote at once to Constantine demanding the restitution of the two duchies to himself, and sent the Marquess of Gerace to receive them from the conqueror’s hands. Scarcely, however, had the letter been despatched when the fatal news of the great Turkish victory at Varna reached the writer. We hear nothing more of Gerace’s mission, for all recognised that the fate of Athens now depended upon the will of the victorious Sultan. To Murad II the shadowy claims of the house of Aragon and the efforts of the house of Palaiologos were alike indifferent. Nerio’s attitude at this crisis was pitiful in the extreme. The Turks punished him for having given way to Constantine. Constantine again threatened him for his obsequiousness in promising to renew his tribute to the Turks. But the Sultan, true to the traditional Turkish policy of supporting the weaker of two rival Christian nationalities, forced the Greek Despot to evacuate the Florentine duchy. Nerio had the petty satisfaction of accompanying his lord and master to the Isthmus and of witnessing the capture of the famous Six-mile Rampart, in which the Greeks had vainly trusted, by the Serbian janissaries. Five years later, in 1451, a Venetian despatch gives us a last and characteristic glimpse of the wretched Nerio, when the Venetian envoy to the new Sultan, Mohammed II, is instructed to ask that potentate if he will compel his vassal, “the lord of Sithines and Stives,” to settle the pecuniary claims of two Venetians[120].