This name derives from the Ancient Greek name “Kýrillos (Κύριλλος)”, which in turn derives from “kúrios (κύριος) Kúrillos (Κύριλλος)“, meaning “lord, master, guardian, ruler, owner, ruling, governing, having power”. 1) Saints Cyril and Methodius were Byzantine Greek brothers born in Thessaloniki in the 9th century who became Christian missionaries among the Slavic peoples of the Great Moravia and Pannonia. Through their work they influenced the cultural development of all Slavs, for which they received the title "Apostles to the Slavs". They are credited with devising the Glagolitic alphabet, the first alphabet used to transcribe Old Church Slavonic. 2) Cyril of Alexandria (~376– 444) was the Patriarch of Alexandria from 412 to 444. He was enthroned when the city was at the height of its influence and power within the Roman Empire. The Cyrillic script is an alphabetic writing system employed across Eastern Europe, North and Central Asian countries. It is based on the Early Cyrillic, which was developed in the First Bulgarian Empire during the 9th century AD at the Pre-Slavonic Literary School.