Glagothic was the basis used by the First Bulgarian Empire to create this Eastern European lettering system in 10th Century A.D. This was initially meant to translate Greek religious texts to a system the Slavs can use. Cyril, with his brother, Methodius, created the first Slavic alphabet – the Glagothic.
The answer to the origins of the Cyrillic Alphabet lies in its name. If you want to specialize in Cyrillic typography, including various Slavic languages is a plus. That’s why it pays to include support for this linguistic system when creating design elements, like fonts. Believe it or not, about 250 million people use Cyrillic, either as a national language or as an alphabet.