Old Novgorod dialect (Russian: древненовгородский диалект, dryevnyenovgorodsky dialekt; also translated as Old Novgorodian or Ancient Novgorod dialect) is a term introduced by Andrey Zaliznyak to describe the dialect found used in the Old East Slavic birch bark writings ("berestyanaya gramota"). Dating from the 11th to 15th centuries, the letters were excavated in Novgorod and its surroundings.
For linguists, Old Novgorodian is particularly of interest in that it has retained some archaic features which were lost in other Slavic dialects, such as the absence of second palatalization. Furthermore, letters provide unique evidence of the Slavic vernacular, as opposed to the Church Slavonic which dominated the written literature of the period. Most of the letters feature everyday business and personal correspondence, instructions, complaints, news, reminders etc. Such widespread usage indicates a high level of literacy, including among women and children.
Today, the study of Novgorodian birch bark letters is an established scholarly field in Russian historical linguistics, with far-ranging historical and archaeological implications for the study of the Russian Middle Ages.
The first birch bark letter was found on July 26, 1951 by Nina Fedorovna Akulova. At least 1025 have been unearthed since, 923 in Novgorod alone. Almost all of them were written with styluses of bronze and iron, and never ink. The letters were preserved due to the swampy soil which isolated them from oxygen. Many letters are found buried amidst the layers under streets which were previously paved with logs.
The short birch-bark texts are written in a peculiar Slavic vernacular, reflecting living speech, and almost entirely free of the heavy Church Slavonic influence seen in the literary language of the period. Some of the observed linguistic features are not found in any other Slavic dialect, representing important Proto-Slavic archaisms.