Barbaro belonged to a noble Venetian family. He was present in Constantinople throughout the siege, kept a journal[4] of what he saw and heard, and, though full of prejudices against Genoese, Greeks, and Turks, contrives to tell his story in a manner which carries conviction of its truthfulness. His narrative conveys the impression of an independent observer who had no object in writing except to relate what he knew about the siege. While probably written from day to day, the diary bears internal evidence of having been revised after he had left the city. Its language is old-fashioned colloquial Venetian and has often puzzled Italians whom I have called in to my aid. The original manuscript of the diary was preserved in Venice by members of the Barbaro family until 1829. After various adventures it came in 1837 into the possession of the Imperial and Royal Marciana Library in Venice. In 1854 it was entrusted to Enrico Cornet, and was published by him for the first time in 1856. Critobulus, the author of the ‘Life of Mahomet the Second,’ was a man of a different type. Nothing is known of him beyond what is contained in his Life of Mahomet.[5] He describes himself as ‘Critobulus the Islander.’ After the capture of Constantinople, when the archons of Imbros, Lemnos, and Thasos feared that the Turkish admiral would shortly approach to annex these islands, messengers were sent to the admiral and succeeded, by offering voluntary submission and by paying him a large bribe, in avoiding the general pillage which usually followed a Turkish conquest. Shortly afterwards, Critobulus took service under the sultan and was made archon of Imbros. In this capacity he received the submission of Lemnos and other places. He continued to hold this office for at least four years. Book III. of his history contains (_inter alia_) an account of what he himself did as the servant of Mahomet. Probably he went to reside in Constantinople in 1460. His history covers the first seventeen years of Mahomet’s reign. It is dedicated to the sultan and is followed by an apology to his fellow Greeks for having written it. While open to the charge of not allowing himself an altogether free hand in revealing the faults and cruelties of his master, Critobulus claims that he has taken great pains to know the truth of what he relates. As he wrote a few years after the siege and at leisure, his narrative does not show the signs of haste which mark many of the shorter narratives of that event: such, for example, as those of Leonard, of the Podestà of Pera, of Cardinal Isidore in the ‘Lamentatio,’ and of others. As he continued to belong to the Orthodox Church and to the Greek as opposed to the Roman party in that Church, his history is free from the denunciations of his fellow Christians for having refused the union agreed to at Florence. The writer’s characteristics as a Greek, but also as a servant of the sultan, show themselves in his work. He expresses sympathy with his