St. Cyril was a priest and a philosopher and accompanied his brother St. Methodius to Moravia to preach the Gospel. They both perfected a Slavonic alphabet which is now known as the Cyrillic alphabet and translated the liturgy into this language. They were summoned to Rome, where Cyril died on this date in 869, and Methodius was consecrated bishop and sent to Pannonia. He died on April 6, 885, in Velehrad, Czech Republic, after working tirelessly on spreading the Gospel. According to the 1962 Missal of Bl. John XXIII the Extraordinary Form of the Roman Rite, their feast is celebrated on July 7.