Saint Cyril
Saint Cyril of Jerusalem was a 4th-century bishop and a Doctor of the Church. Saint Cyril of Alexandria was a 5th-century theologian. Another Saint Cyril, known as Kiril, was a 9th-century translator and a Byzantine missionary to the Slavs. He, together with his brother Methodius, created an alphabet called the Glagolitic alphabet to serve the needs of the Slavic world, translating the Bible into the Church Slavic language. Later, their students created a simpler and graphically usable alphabet, which is known after Cyril as the Cyrillic alphabet and is still used by millions of people.