The Eastern South Slavic dialects form the eastern subgroup of the South Slavic languages. They are spoken mostly in Bulgaria and North Macedonia, and adjacent areas in the neighbouring countries. The
Front cover of the first grammar book of the modern Bulgarian language published by Neofit Rilski in 1835. Rilski was born in Bansko, easternmost Ottoman Macedonia, a town lying exactly on the Yat border. His grammar was based on the dialect of his hometown and included significant admixture from Church Slavonic.
The first complete edition of the Bible in modern Bulgarian, translated by Petko Slaveykov and printed in Istanbul in 1871. The Bible was published primarily in the Eastern dialect. Slaveykov was from Veliko Tarnovo, but his family hailed from Bansko or Yakoruda in Pirin Macedonia.
Front cover of On the Macedonian Matters published in 1903 by Krste Misirkov, in which he laid down the principles of modern Macedonian. Misirkov came from the village of Postol in Ottoman Central Macedonia.
Decision about the proclamation of the Macedonian as an official language on 2 August 1944 by ASNOM.
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
Eastern South Slavic
…dialect areas. This is evidenced by some isoglosses of ancient origin, dividing the western and eastern parts of the South Slavic range. The extinct Old Church Slavonic, which survives in a relatively small body of manuscripts, most of them written in the First Bulgarian Empire during the 10th century, is also classified…
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