by Pope Stephen V. The same Pope forbade the use of the Slavic liturgy and placed the infamous as Methodius' successor. The latter exiled the disciples of the two brothers from Great Moravia in 885. They fled to the First Bulgarian Empire, where they were welcomed and commissioned to establish theological schools - the Preslav and Ohrid literary schools. In the school in Preslav they devised the Cyrillic script on the basis of the Greek and Glagolitic alphabets. Cyrillic gradually replaced Glagolitic as the alphabet of the Old Bulgarian, which became the official language of the Bulgarian Empire and later spread to the Eastern Slav lands of Kievan Rus'. Cyrillic eventually spread throughout most of the Slavic world to become the standard alphabet in the Eastern Orthodox Slavic countries. Hence, the efforts of Cyril and Methodius and their disciples also paved the way for the spread of Christianity throughout Eastern Europe. Methodius' body was buried in the main cathedral church of Great Moravia. Until today it remains an open question which city was capital of Great Moravia and therefore the place of Methodius' eternal rest remains unknown. Invention of the Glagolitic and Cyrillic alphabets The Glagolitic and Cyrillic alphabets are the oldest known Slavic alphabets, and were created by the two brothers and/or their students, to translate the Gospels and liturgical books into the Slavic languages. The early Glagolitic alphabet was used in Great Moravia between 863 (the arrival of Cyril and Methodius) and 885 (the expulsion of their students) for government and religious documents and books, and at the Great Moravian Academy (Veľkomoravské učilište) founded by Cyril, where followers of Cyril and Methodius were educated, by Methodius himself among others. The alphabet has been traditionally attributed to Cyril. That attribution has been confirmed explicitly by the papal letter Industriae tuae (880) approving the use of Old Church Slavonic, which says that the alphabet was "invented by Constantine the Philosopher". The term invention need not exclude the possibility of the brothers having made use of earlier letters, but implies only that before that time the Slavic languages had no distinct script of their own. The early Cyrillic alphabet was developed in the First Bulgarian Empire and later finalized and spread by disciples Kliment and Naum in the Ohrid and Preslav schools of Knyaz Boris I Baptizer as a simplification of the Glagolitic alphabet which more closely resembled the Greek alphabet.