(Greek: Κύριλλος καὶ Μεθόδιος, Old Church Slavonic: Кѷриллъ и Меѳодїи) were 9th-century Byzantine Greek brothers born in Thessalonica, Macedonia, in the Byzantine Empire. They were the principal Christian missionaries among the Slavic peoples of the Great Moravia and Pannonia, introducing Orthodox Christianity and writing to the hitherto illiterate, pagan Slav migrants into parts of Macedonia and elsewhere in the Balkans. Through their work they influenced the cultural development of all Slavs, for which they received the title "Apostles to the Slavs". They are credited with devising the Glagolitic alphabet, the first alphabet used to transcribe Old Church Slavonic. Its descendant script, the Cyrillic, is still used by many languages today. After their deaths, their pupils continued their missionary work among other Slavs. Both brothers are venerated in the Orthodox Church as saints with the title of "equal-to-apostles".
In 863 they began the task of translating the Slavic languages into written characters, that were called Cyrillic, which they used in their preaching and apostolate. In the same year, they also start translating the Bible into the language now known as Old Church Slavonic and travelled to Great Moravia to promote it. They enjoyed considerable success in this endeavour. The two brothers soon converted many people to Christianity. For the purpose of this mission, they devised the Glagolitic alphabet, the first alphabet to be used for Slavonic manuscripts. The Glagolitic alphabet was suited to match the specific features of the Slavic language
However, they came into conflict with German ecclesiastics who opposed their efforts to create a specifically Slavic liturgy, and the lack of a Bishop to ordain more priest. Methodius vindicated his orthodoxy at Rome, the more easily as the creed was still recited there without the Filioque, and promised to obey in regard to the liturgy. The other party was conciliated by giving him a Swabian, Wiching, as his coadjutor. When relations were strained between the two, John VIII steadfastly supported Methodius; but after his death (December 882) the archbishop's position became insecure, and his need of support induced Goetz to accept the statement of the Vita (xiii.) that he went to visit the Eastern emperor.
It was not until after Methodius' death, which is placed, though not with certainty, on 8 April 885, that the animosity erupted into an open conflict. Gorazd, whom Methodius had designated as his successor, was not recognised by Pope Stephen V. The same Pope forbade the use of the Slavic liturgy and placed the infamous Wiching as Methodius' successor. The latter exiled the disciples of the two brothers from Great Moravia in 885. They fled to the First Bulgarian Empire, where they were welcomed and commissioned to establish theological schools. There they devised the Cyrillic script on the basis of the Glagolitic. Cyrillic gradually replaced Glagolitic as the alphabet of the Old Church Slavonic language, which became the official language of the Bulgarian Empire and later spread to the Eastern Slav lands of Kievan Rus'. Cyrillic eventually spread throughout most of the Slavic world to become the standard alphabet in the Orthodox Slavic countries. Hence, Cyril and Methodius' efforts also paved the way for the spread of Christianity throughout Eastern Europe.
The early Cyrillic alphabet was developed in the First Bulgarian Empire and later finalized and spread by disciples Kliment and Naum in the Ohrid and Preslav schools of Tsar Boris' Bulgaria as a simplification of the Glagolitic alphabet which more closely resembled the Greek alphabet. It was developed by the disciples of Saints Cyril and Methodius at the Preslav Literary School at the end of the 9th century.
After the death of Cyril, Clement of Ohrid accompanied Methodius from Rome to Pannonia and Great Moravia. After the death of Methodius in 885, Clement headed the struggle against the German clergy in Great Moravia along with Gorazd. After spending some time in jail, he was expelled from Great Moravia, and in 885 or 886 reached the borders of the Bulgarian Empire together with Naum of Preslav, Angelarius, and possibly Gorazd (according to other sources, Gorazd was already dead by that time). The four of them were afterwards sent to the Bulgarian capital of Pliska, where they were commissioned by Tsar Boris I of Bulgaria to instruct the future clergy of the state in the Slavonic language.
After the adoption of Christianity in 865, religious ceremonies in Bulgaria were conducted in Greek by clergy sent from the Byzantine Empire. Fearing growing Byzantine influence and weakening of the state, Boris viewed the adoption of the Old Slavonic language as a way to preserve the political independence and stability of Bulgaria, so he established two literary schools (academies), in Pliska and Ohrid, where theology was to be taught in the Slavonic language. While Naum of Preslav stayed in Pliska working on the foundation of the Pliska Literary School, Clement was commissioned by Boris I to organise the teaching of theology to future clergymen in Old Church Slavonic at the Ohrid Literary School. For seven years (886-893) Clement taught some 3,500 students in the Slavonic language and the Glagolitic alphabet. .
Methodius' body was buried with his brother in the church of St. Clement in Rome.
Pope Leo XIII introduced their feast into the calendar of the Roman Catholic Church. In 1980, Pope John Paul II declared them co-patron saints of Europe, together with Benedict of Nursia.
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