Ohrid and the Slavic literary school

After the disciples of Cyril and Methodius were driven out of Great Moravia, the Bulgarian ruler Boris I sent Clement and Naum to the Ohrid region in 886. Clement's school at Plaošnik trained thousands of priests and teachers to read and write Old Church Slavonic, the written language of Orthodox Slavs. Ohrid later became the seat of Tsar Samuel's patriarchate and, until 1767, of an independent archbishopric, and filled with painted churches.