Analysis of information sources in references of the Wikipedia article "基里尔 (东罗马帝国传教士)" in Chinese language version.
. the activity of the brothers Constantine (later renamed Cyril) and Methodius, aristocratic Greek priests who were sent from Constantinople.
In Eastern Europe, the first translations of the Bible into the Slavoruic languages were made by the Greek missionaries Cyril and Methodius in the 860s
The most important instance where translation and the beginning church did coincide closely was in Slavonic under the brothers Cyril, Methodius, with the Bible completed by A.D. 880 This was a missionary translation but unusual again (from a modern point of view) because not a translation into the dialect spoken where the missionaries were The brothers were Greeks who had been brought up in Macedonia,
Constantine (Cyril) and his brother Methodius were the sons of the droungarios Leo and Maria, who may have been a Slav.
