Over the last decades the problem of the existence of Byzantine philosophy has been posed in terms of the determination of its status, its function, and its subject matter. To a certain extent, this approach to Byzantine philosophy has been motivated by the increasing disciplinary autonomy reached by the other branches of what is nowadays called «medieval philosophy». A series of significant scholarly achievements over the last twenty years have contributed to the development of more-or-less well defined scholarly fields of (...) research concerning the medieval Latin, Arabic, and Jewish philosophical traditions. In regard to Byzantine philosophy the situation is much more complicated. In the first chapter of his La philosophie médiévale, Alain de Libera devotes his first words to the retarded scholarly development of the study of Byzantine philosophy. He claims that Byzantine philosophy has been mainly ignored and misunderstood, and has not been deeply studied. However, from the second half of the twentieth century one can find relevant and extremely important attempts to establish not only the basic features and developments, but the very existence of Byzantine philosophy. In this Forschungsbericht I shall attempt to reconstruct the scholarly debate on this topic, testing the main interpretive attitudes against some concrete cases of thinkers who lived in the area of the Eastern Roman Empire and who are labelled by most modern historians as «Byzantine». (shrink)