10. Another Slavic version is conveniently spoken of as the ‘Memoirs of the Polish Janissary.’ Its author, after serving with the Turks and, according to his own statement, being present at the siege, withdrew to Poland. The original MS. was first published in 1828. The Turkish authors available who speak of the siege are: 11. Sad-ud-din, ‘The Capture of Constantinople from the Tajut-Tevarikh (1590),’ translated into English by E. J. W. Gibb (Glasgow, 1879). This work professes to be based on the accounts of earlier Turkish historians. 12. ‘Tarich Muntechebati Evliya Chelibi,’ a translation of which is given in the elder Mordtmann’s ‘Eroberung.’ 13. Ahmed Muktar Pasha’s ‘Conquest of Constantinople and the Establishment of the Ottomans in Europe,’ brought out only in 1902, on the anniversary of the present sultan’s accession. 14. An Armenian ‘Mélodie Élégiaque,’ written by a monk named Philip, who was present at the siege. This was printed in Lebeau’s ‘Histoire du Bas-Empire.’ Dethier published the original version in Armenian. I gratefully acknowledge my indebtedness to Dr. Mordtmann’s studies of the archæology and topography of Constantinople,[9] and to Professor A. van Millingen’s ‘Byzantine Constantinople’[10] a work which is the most careful study of the history of those parts of the walls and other portions of the city treated of which has yet been published. I must also tender him sincere thanks for many suggestions made in the course of friendly intercourse and in the discussion of matters of mutual archæological interest, and for permission to reproduce his map of Constantinople. All future writers on the topography and archaeology of Constantinople will be under obligations to Dr. Mordtmann and Professor van Millingen, who have worthily continued the work of Gyllius and Du Cange. A few words must be added as to the title of this book. Why, it may be asked, should it be the ‘Destruction of the Greek Empire’? Why not follow the example of the late Mr. Freeman, and of his distinguished successor, Professor J. B. Bury, and speak of the ‘Later Roman Empire’? My plea is one of confession and avoidance.