グラゴル文字
After the deaths of Cyril and Methodius, the Glagolitic alphabet ceased to be used in Moravia for political or religious needs. In 885, Pope Stephen V (VI) issued a bull to restrict spreading and reading Christian services in languages other than Latin or Greek. On the other side, Svatopluk I followed the interests of the Frankish Empire and prosecuted the students of Cyril and Methodius. In 886, Kliment (also known as Clement of Ohrid), Naum, Gorazd, Angelarii and Sava arrived in the First Bulgarian Empire where they were warmly accepted by the Tsar Boris I of Bulgaria. Both Glagolitic and Cyrillic alphabet were used until 13th-14th century in Bulgaria. The Cyrillic alphabet (which borrowed some letters from the Glagolitic alphabet) was developed at the Preslav Literary School in the late 9th century. The Glagolitic alphabet was preserved only by the clergy of Croatia and Dalmatia to write Church Slavonic until the early 19th century. Glagolitic also spread in Bohemia with traces in Panonia, Moravia and Russia.