Methodius was a prominent Christian bishop and theologian in the 9th century, known for his role in spreading Christianity among the Slavic peoples. He, along with his brother Cyril, created the Glagolitic alphabet, which was the first alphabet used to write the Old Church Slavonic language. This innovation helped to translate the Bible and other religious texts, making them accessible to the Slavic population. Methodius is often celebrated as a saint in both the Eastern Orthodox and Roman Catholic traditions. His efforts in missionary work and education laid the foundation for the development of Slavic culture and literacy, significantly impacting the region's history.