This article argues that “philosophy” is a tradition which constantly redefines itself, and which, consequently, resists universal definition. Philosophy is, ultimately, whatever philosophers think it is. This discussion suggests that the most reasonable way of dealing with the vagueness of the term “Byzantine philosophy” is to focus on those Byzantine texts and authors which most closely relate to the concerns of other, more generally recognized, philosophical texts and authors. It starts by sketching a historical overview of Greek philosophy in the (...) Middle Ages and then presents some philosophical issues in logic, epistemology, metaphysics, and natural philosophy in which Byzantine philosophers engaged. (shrink)