Later, the disciples of Cyril and Methodius were expelled from Great Moravia by King Svatopluk I, who re-orientated the Empire to Western Christianity. Nevertheless, the expulsion had a significant impact on countries where the disciples settled and from there continued their evangelizing missions - especially Southeastern Europe, firstly Bulgaria, and later Eastern Europe. Arriving in the First Bulgarian Empire, the disciples continued the Cyrilo-Methodian mission and the Glagolitic script was substituted by Cyrillic which used some of its letters. Early Cyrillic alphabet was developed during the 9th century AD at the Preslav Literary School. The Cyrillic script and translations of the liturgy were disseminated to other Slavic countries, particularly in the Balkans and Kievan Rus', charting a new path in these Slavic nations' cultural development and establishing the Cyrillic alphabets as they are now known in Bulgaria, Belarus, Bosnia and Herzegovina, Mongolia, Montenegro, North Macedonia, Russia, Serbia, and Ukraine.