Old Bulgarian language

Old Church Slavonic
ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ ⰧⰈⰟⰊⰍⰟ словѣ́ньскъ ѩꙁꙑ́къ slověnĭskŭ językŭ
Native to	formerly in Slavic areas, under the influence of Byzantium (both Catholic and Orthodox)
Region	Central Europe Eastern Europe Southeastern Europe
Era	9th–11th centuries; then evolved into several variants of Church Slavonic
Language family	Indo-European Balto-Slavic Slavic South Old Church Slavonic
Writing system	Glagolitic, Cyrillic
Language codes
ISO 639-1	`cu (with Church Slavonic)`
ISO 639-2
ISO 639-3	(with Church Slavonic)
Glottolog	`chur1257` (Church Slavic)
Linguasphere	`53-AAA-a`
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Old Church Slavonic (pronunciation: /sləˈvɒnɪk/, /slæˈ-/), also known as Old Church Slavic (/ˈslɑːvɪk, ˈslæ-/; often abbreviated to OCS; self-name словѣ́ньскъ ѩꙁꙑ́къ, slověnĭskŭ językŭ), was the first Slavic literary language. The 9th-century Byzantine missionaries Saints Cyril and Methodius (of Slavic descent, Greek descent, or both), are credited with standardizing the language and using it in translating the Bible and other Ancient Greek ecclesiastical texts as part of the Christianization of the Slavs. It is thought to have been based primarily on the dialect of the 9th century Byzantine Slavs living in the Province of Thessalonica (now in Greece). It played an important role in the history of the Slavic languages and served as a basis and model for later Church Slavonic traditions, and some Eastern Orthodox and Eastern Catholic churches use this later Church Slavonic as a liturgical language to this day. As the oldest attested Slavic language, OCS provides important evidence for the features of Proto-Slavic, the reconstructed common ancestor of all Slavic languages.