Question: who invented an alphabet for the slavic language
Answer: Saints Cyril and Methodius ( 826 -- 869 , 815 -- 885 ; Greek : Κύριλλος καὶ Μεθόδιος ; Old Church Slavonic : К ѷ риллъ и Ме ѳ одїи ) were two brothers who were Byzantine Christian theologians and Christian missionaries .