By way of Open Access News, we learn of this announcement, recently posted at openaccess.gr:
Taking into consideration the latest developments in scientific publishing, the Institute for Byzantine Research of the National Hellenic Research Foundation has reevaluated the aims of ΣΥΜΜΕΙΚΤΑ, a journal it has published since 1966. Under the new name BYZANTINA SYMMEIKTA, it has become a peer-reviewed open access journal with well-defined processes and scope and it is freely accessible at: http://www.byzsym.org/. Its printed version will be published at the end of each year.
With back issues online to 1994 (PDF).