Early Cyrillic alphabet

The original Cyrillic alphabet was a writing system developed in the First Bulgarian Empire in the tenth century to write the Old Church Slavonic liturgical language. With Christianity having been made the official state religion in 864, Knyaz (Prince) Boris I commissioned the creation of the alphabet. Clement of Ohrid developed the alphabet and named it after his teacher, St. Cyril, a missionary who, along with his brother, Methodius, is credited for inventing the Glagolitic alphabet, an earlier Slavic alphabet and an influence on this one. The alphabet also shows influence from the Greek, Latin, and even the Hebrew alphabet.
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