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_scriptA number of languages written in a Cyrillic alphabet have also been written in a Latin alphabet, such as Azerbaijani, Uzbek, Serbian and Romanian (in the Republic of Moldova until 1989, in Romaniathroughout the 19th century). After the disintegration of the Soviet Union in 1991, some of the former republics officially shifted from Cyrillic to Latin. The transition is complete in most of Mo…