to the Sultan, a visit that required Doukas to bring his new master, Domenico Gattilusio before the Sultan. He was still living on Lesbos in 1462, when it was conquered by the Ottoman Empire by Sultan Mehmed II. It is known that Doukas survived this event, but there is no record of his subsequent life, and he may have died at about this time. Work Doukas was the author of a history of the period 1341–1462; his work thus continues that of Nikephoros Gregoras and John Kantakouzenos, and supplements George Sphrantzes and Laonikos Chalkokondyles. There is a preliminary chapter of chronology from Adam to John V Palaiologos. After the preliminary chapter, he begins his work on history with description of the Battle of Kosovo. Doukas considered the Ottoman conquests as a divine punishment, criticised Mehmed II's immorality and cruelty, and ardently supported the union of the Greek and Latin churches as a prerequisite for saving what was left of the Byzantine Empire. His work is thus "generally considered biased but reliable" and a particularly valuable source since he was an eyewitness to many of the events included in his history, and knew Italian and Turkish and was thus able to draw upon Genoese and Ottoman sources. Doukas is also the only Byzantine source to mention the revolt of Börklüce Mustafa. The editio princeps by I. Bullialdus (Paris, 1649), with a Latin translation on facing pages and copious notes, was based on one manuscript, currently in Paris, Bibliothèque Nationale MS. Gr. 1310 (Grecu's P, dated 16th century). A folio edition was published in Venice by the Javarina Press in 1729. I. Bekker (1834) produced an edition for the Bonn series, which includes a 15th-century Italian translation by an unknown author, found by Leopold Ranke in one of the libraries of Venice, and sent by him to August Bekker; this translation continues where the Greek text ends in mid-sentence, completing the account of the Ottoman conquest of Lesbos. This addition has led some scholars to conclude the Italian translation was made from a more complete copy of Doukas' history, but Harry J. Magoulias has argued that it is more likely "that the translator may have simply borrowed from another source in order to supplement the account of the siege of Mitylene in 1462. A fourth edition of this was prepared by Jacques Paul Migne for the Patrologia Graeca series, vol. 157. For