Cyrillic alphabets - Wikipedia
https://en.wikipedia.org/wiki/Cyrillic_alphabetsNumerous Cyrillic alphabets are based on the Cyrillic script. The early Cyrillic alphabet was developed in the First Bulgarian Empire during the 9th century AD (in all probability in Ravna Monastery) at the Preslav Literary School by Saint Clement of Ohrid and Saint Naum and replaced the earlier Glagolitic script developed by the Byzantine theologians Cyril and Methodius (in all probability in
Cyrillic script - Wikipedia
https://en.wikipedia.org/wiki/Cyrillic_scriptThe Cyrillic script is a writing system used for various languages across Eurasia and is used as the national script in various Slavic, Turkic, Mongolic, Uralic, Caucasian and Iranic-speaking countries in Southeastern Europe, Eastern Europe, the Caucasus, Central Asia, North Asia and East Asia. As of 2019 , around 250 million people in Eurasia use Cyrillic as the official scr…