During the greater part of the fifteenth century the history of the Archipelago presents a monotonous series of family feuds and Turkish aggression. The subdivision of the islands, in order to provide appanages for the younger members of some petty reigning dynasty, was a source of weakness, which recalls the mediæval annals of Germany, nor did there arise among the Dukes of this period a strong man like the founder of the Duchy. One of them was advised by Venice to make the best terms that he could with the Sultan, though complaints were made that he had failed to warn the Venetian bailie of Eubœa of the approaching Turkish fleet, by means of beacon-fires—an incident which takes us back to the _Agamemnon_ of Æschylus. The fall of Constantinople, followed by the capture of Lesbos and Eubœa by the Turks, greatly alarmed the Dukes, who drew closer than ever to the Venetian Republic, and were usually included in all the Venetian treaties. Other misfortunes greatly injured the islands. The Genoese plundered Naxos and Andros, and the volcanic island of Santorin was the scene of a great eruption in 1457, which threw up a new islet in the port. A few years later, Santorin had suffered so much from one cause or another that it contained no more than 300 inhabitants. An earthquake followed this eruption, further increasing the misery of the Archipelago. But this was the age of numerous religious foundations, some of them still in existence, such as the church of Sant’ Antonio at Naxos, which was bestowed upon the Knights of St John, as their arms on its walls remind the traveller. It was about this time too that Cyriacus of Ancona, after copying inscriptions at Athens, visited Andros and other islands of the Ægean. The island rulers not only received him courteously, but ordered excavations to be made for his benefit—a proof of culture which should be set against their wanton destruction of ancient buildings, in order to provide materials for their own palaces—a practice of which the tower at Paros is so striking an example. When we remember that each petty lord considered it necessary to be well lodged, the extent of these ravages may be easily imagined.