The Glagolitic script is the oldest-known Slavic alphabet. It is generally agreed that it was created in the 9th century for the purpose of translating liturgical texts into Old Church Slavonic by Cyr
A page from the Zograf Codex with text of the Gospel of Luke
The Baška tablet, found in the 19th century on Krk, conventionally dated to about 1100
The first page of the Gospel of Mark from the 10th–11th century Codex Zographensis, found in the Zograf Monastery in 1843
In a book printed in 1591, Angelo Rocca attributed the Glagolitic script to Saint Jerome.
Old Church Slavonic or Old Slavonic is the first Slavic literary language and the oldest extant written Slavonic language attested in literary sources. It belongs to the Eastern South Slavic subgroup
Glagolitic script
…the oldest-known Slavic alphabet. It is generally agreed that it was created in the 9th century for the purpose of translating liturgical texts into Old Church Slavonic by Cyril, a Christian monk from Thessalonica. He and his brother Methodius were sent by the Byzantine Emperor to Great Moravia as missionaries. After…
A page from Codex Zographensis, 10th or 11th century.
Example of the Cyrillic alphabet: excerpt from the manuscript Vidin Miscellany, written in Middle Bulgarian, 1360
A page from the Flowery Triodion (Triod' cvetnaja), a Polish book printed in Kraków in about 1491, one of the oldest printed Byzantine-Slavonic books, National Library of Poland
A page from the Gospel of Miroslav, Serbian medieval manuscript, a 12th-century Byzantine-Slavonic book, National Library of Serbia