The genre of lives of the saints was introduced in the Slavic world in the Bulgarian Empire in the late 9th and early 10th century, where the first original hagiographies were produced on Cyril and Methodius, Clement of Ohrid and Naum of Preslav. Eventually the Bulgarians brought this genre to Kievan Rus' together with writing and also in translations from the Greek language. In the 11th century, the Rus' began to compile the original life stories of the first Rus'ian saints, e.g. Boris and Gleb, Theodosius Pechersky etc. In the 16th century, Metropolitan Macarius expanded the list of the Rus'ian saints and supervised the compiling process of their life stories. They would all be compiled in the so-called "Velikiye chet'yi-minei" catalog (Великие Четьи-Минеи, or Great Menaion Reader), consisting of 12 volumes in accordance with each month of the year. They were revised and expanded by St. Dimitry of Rostov in 1684–1705.