The above very brief introduction to the study of “Galen the philosopher” may also serve as a preliminary warning of the peculiar challenges that any such study faces: the vast body of texts, many both diffuse in structure and unexamined by modern scholarship; the wide range of genres (most not primarily philosophical), dialectical contexts and rhetorical arguments from which his philosophical views must be reconstructed; his eclectic and decontextualized use of philosophical terminology for his own purposes; certain specific losses amongst his specialist treatises of philosophy.