 After the deaths of Cyril and Methodius, the Glagolitic alphabet ceased to be used in Moravia, but their students continued to propagate it in the First Bulgarian Empire, where it was subsequently also displaced by the Cyrillic alphabet (which augmented some letters from the Glagolitic alphabet) developed at the Preslav Literary School.The Glagolitic alphabet was preserved only by the clergy of Croatia to write Church Slavonic until the early 19th century.The name was not created until many centuries after the script's creation, and comes from the Old Church Slavonic глаголъ "glagolŭ" "utterance".