827 and 826, Thessaloniki, Byzantine Empire (present-day Greece)Died:
February 14, 869 and 6 April 885
Bulgaria, Czech Republic (including Bohemia, and Moravia), Ecumenism, unity of the Eastern and Western Churches, Europe, Slovakia
BISHOPS AND CONFESSORS, APOSTLES TO THE SLAVSThese brothers, the Apostles of the Slavs, were born in Thessalonica, in 827 and 826 respectively. Though belonging to a senatorial family they renounced secular honours and became priests. They were living in a monastery on the Bosphorous, when the Khazars sent to Constantinople for a Christian teacher. Cyril was selected and was accompanied by his brother. They learned the Khazar language and converted many of the people. Soon after the Khazar mission there was a request from the Moravians for a preacher of the Gospel. German missionaries had already laboured among them, but without success. The Moravians wished a teacher who could instruct them and conduct Divine service in the Slavonic tongue. On account of their acquaintance with the language, Cyril and Methodius were chosen for their work. In preparation for it Cyril invented an alphabet and, with the help of Methodius, translated the Gospels and the necessary liturgical books into Slavonic. They went to Moravia in 863, and laboured for four and a half years. Despite their success, they were regarded by the Germans with distrust, first because they had come from Constantinople where schism was rife, and again because they held the Church services in the Slavonic language. On this account the brothers were summoned to Rome by Nicholas I, who died, however, before their arrival. His successor, Adrian II, received them kindly. Convinced of their orthodoxy, he commended their missionary activity, sanctioned the Slavonic Liturgy, and ordained Cyril and Methodius bishops. Cyril, however, was not to return to Moravia. He died in Rome, 4 Feb., 869.
Formerly the feast of Saints Cyril and Methodius was celebrated in Bohemia and Moravia on 9 March; but Pius IX changed the date to 5 July. Leo XIII, by his Encyclical "Grande Munus" of 30 September, 1880, extended the feast to the universal Church.
(Taken from Catholic Encyclopedia)