structural:expansion, quality:corruption
Mission to the Khazars

About the year 860, Byzantine Emperor Michael III and the Patriarch of Constantinople Photius (a professor of Cyril's at the University and his guiding light in earlier years), sent Cyril on a missionary expedition to the Khazars who had requested a scholar be sent to them who could converse with both Jews and Saracens. It has been claimed that Methodius accompanied Cyril on the mission to the Khazars, but this may be a later invention. The account of his life presented in the Latin "Legenda" claims that he learned the Khazar language while in Chersonesos, in Taurica (today Crimea).

After his return to Constantinople, Cyril assumed the role of professor of philosophy at the University. His brother had by this time become a significant figure in Byzantine political and administrative affairs, and an abbot of his monastery.