>>514205302
>The Cyrillic alphabet is Greek alphabet with a couple of inverted letters
Its the Small letters of the Greek alphabet created by Saints Cyril and Methodius

https://en.wikipedia.org/wiki/Cyrillic_script
>Since the script was conceived and popularised by the followers of Cyril and Methodius in Bulgaria, rather than by Cyril and Methodius themselves,[13] its name denotes homage rather than authorship.[14]

https://en.wikipedia.org/wiki/Cyril_and_Methodius
>They are credited with devising the Glagolitic alphabet, the first alphabet used to transcribe Old Church Slavonic.[7] After their deaths, their pupils continued their missionary work among other Slavs.


TLDR: New Slavic Script (Glaholica, Cyrilica) made from Greek Script created by Slavic Bishops living in Greece who were sent on a mission to help spread Christianity to modern day Slovak and Moravian Lands.