The book presents the 4th tome of Corpus of Byzantinorossica. There are byzantine literary monuments (until 13th century). Among them are texts of agiography and epistolography, various memoirs, historical and nature study. The book includes translations and accompanied by commentary of all these monuments, where Russian-Byzantine relations are described. The Greek texts of the old-Russian “Vita Antonii” and the “Vita Pheodosii” are especially interesting.