The two saints were brothers, born in Thessalonica. St Methodius, the elder brother, served as a soldier for ten years before becoming a monk. Cyril was librarian at the Hagia Sophia in Constantinople; then he too became a monk.
  Their first missionary work was not among the Slavs: When the king of the Khazars (a Mongol people who then inhabited much of what is now Russia) petitioned the Emperor Michael to sent teachers to instruct his people, the Emperor chose Cyril and Methodius as his emissaries. They converted the Khazar king to the Christian faith, along with many of his nobles and commoners.
  When King Rostislav of Moravia likewise sought teachers of the Christian faith, Cyril and Methodius were again sent forth. This time they devised an alphabet for the Slavic language and used it to translate many of the Greek service books into the language of the people. (In theory, the Orthodox people have always been privileged to hear the Church's services in their own tongue, though of