A report on Old Church Slavonic and Montenegrin language

The medieval literature was mostly written in Old Church Slavonic and its recensions, but most of the 19th century works were written in some of the dialects of Montenegro.

The pronunciation of yat (ѣ/ě) differed by area. In Bulgaria it was a relatively open vowel, commonly reconstructed as, but further north its pronunciation was more closed and it eventually became a diphthong (e.g. in modern standard Bosnian, Croatian and Montenegrin, or modern standard Serbian spoken in Bosnia and Herzegovina, as well as in Czech — the source of the grapheme ě) or even in many areas (e.g. in Chakavian Croatian, Shtokavian Ikavian Croatian and Bosnian dialects or Ukrainian) or (modern standard Serbian spoken in Serbia).