Baptism and the Conversion of Bulgaria
The sources place Boris's baptism in 864, undertaken under Byzantine influence following a period of famine and hardship. He received the name Michael after the reigning emperor Michael III, who served as his godfather by proxy. In the years that followed, Christianity was established as the faith of the Bulgarian state, and the baptism of the people was carried out with Byzantine priests.
By tradition this conversion is understood as resolving the religious division between the Bulgar military elite and the Slavic majority, binding them together in a shared Christian faith. Boris is credited with founding the organized Church in Bulgaria and with the building of churches across the country.