Cyril and Methodius
9th-century Byzantine Christian theologians and missionaries
Cyril (Greek: Κύριλλος, romanized: Kýrillos; born Constantine, 826–869) and Methodius (Μεθόδιος, Methódios; born Michael, 815–885) were brothers, Byzantine Christian theologians and missionaries. For their work evangelizing the Slavs, they are known as the "Apostles to the Slavs".