After Justinian I, the next cycle in which Christianity began to spread began in the 9th century, when Clement of Ohrid and Saint Naum instituted the Ohrid Literary School during  the Christianization of Bulgaria.
After Justinian I, the subsequent period in which Christianity began to spread started in the 9th century, when Clement of Ohrid and Saint Naum established the Ohrid Literary School during the Christianization of Bulgaria.