The Bulgarian Orthodox Church is the national church of Bulgaria and one of the oldest Christian institutions in the world. It was established in the 9th century and is part of the Eastern Orthodox tradition. The church plays a significant role in the cultural and spiritual life of the Bulgarian people, promoting religious practices and preserving national identity. The church is governed by a hierarchy of bishops, with the Patriarch of Bulgaria as its leader. Services are conducted in Old Bulgarian and Church Slavonic, reflecting the church's historical roots. The Bulgarian Orthodox Church also celebrates various religious holidays, including Christmas and Easter, which are important to its followers.