Old Church Slavonic
The 10th- or 11th-century Gospel Book "Codex Marianus", written in Old Church Slavonic in the Glagolithic script, is one of the oldest known Slavic manuscripts. It was partly written in the Serbian redaction of Old Church Slavonic. Other early manuscripts include the 11th-century "Grškovićev odlomak Apostola" and "Mihanovićev odlomak".