The Golden Age of Bulgaria is the period of the Bulgarian cultural prosperity during the reign of emperor Simeon I the Great (889—927).
During this period there was an increase of literature, writing, arts, architecture and liturgical reforms.
[1] The most important genres were Christian edifying oratory eulogies, lives of saints, anthems and poetry, chronicles, and historical narratives.
The Old Bulgarian, also called Old Church Slavonic, language was declared as official in the same year.
In the following centuries the liturgy in Bulgarian language and alphabet were adopted by many other Slavic peoples and counties.