Cyril and Methodius
815 (Methodius) / 827 (Cyril) — 885 · Feast day: February 14
Two Greek brothers who became missionaries to the Slavic peoples. Realizing the Slavs had no written language, Cyril invented the Glagolitic alphabet (precursor to Cyrillic) to translate the Bible and liturgy into their native tongue. They fought for the right to worship in the vernacular.