What is another word for Old Bulgarian?
Pronunciation: [ˈə͡ʊld bʌlɡˈe͡əɹi͡ən] (IPA) 
Old Bulgarian is a term used to refer to a language that was spoken in Bulgaria during the Middle Ages. However, this term has several synonyms that can be used interchangeably to describe the same language. These include Old Church Slavonic, Old Slavonic, and Old Bulgarian Church Slavonic. These terms are used to refer to the language that was developed by the brothers Cyril and Methodius in the 9th century. Old Bulgarian is considered to be the ancestor of modern Bulgarian and is still used in the liturgy of the Bulgarian Orthodox Church. The language was also important in spreading the Eastern Orthodox Christianity across Eastern Europe.
