The present paper aims to provide an initial but illuminating account of the work already accomplished for the Byzantine period essentially between the 5th and 15th centuries. After a preliminary presentation of our current progress until now (May 2014) and the general, conceptual framework of our research still in progress, we shall present in brief some remarks on texts and writers selected before closing with a thematic classification of the problematics and topics that we have already explored for the period below. The project is built around a specific periodization which aims mostly to delineate conceptual eras according to major turning points in the History of Religion and Ideas, and acts as a flexible framework.