Svi͡ati͡eĭshago Patrīarkha Fotīi͡a, Arkhīepiskopa Konstantinopolʹskago XLV neizdannykh pisem

Photius I Saint, Patriarch of Constantinople, Imperatorskīĭ sanktpeterburgskīĭ universitet. Istoriko-filologicheskīĭ fakulʹtet, Athanasios Papadopoulos-Kerameus