Methodius' Return to Moravia

10. After these things had taken place, Methodius returned under Papal orders to Moravia as bishop. In that province, having become a spiritual model for his flock, he began to serve Catholicism more keenly every day. He strongly resisted the factions of reform, lest the Catholic name fall through unsound thinking. He educated prince Svatopluk, who succeeded Rastislav in religious matters. He warned him about shirking his duties, rebuked him, and finally excommunicated him. For these reasons he incurred the anger of that revolting and wicked tyrant; then he was sent into exile. He was recalled a short time later, and his efforts produced a change of heart in the prince and an understanding that he should return to a new purity of life.

11. It is remarkable that Methodius' vigilant love had crossed the borders of Moravia and reached the Liburnians and Serbs, since he was Cyril's successor. Now it reached the Pannonians, whose prince, Kocel, he disposed to the Catholic religion and retained in his duties. It also reached the Bulgarians, whom he confirmed in the faith along with their leader Boris. Then he dispensed the gifts of heaven to the Dalmatians. Finally, he worked strenuously that the Carinthians might be brought to the knowledge and the worship of the one true God.