Old East Slavic was a language used by the East Slavs from the 7th or 8th century to the 13th or 14th century, until it diverged into the Russian and Ruthenian languages. Ruthenian eventually evolved
Sheet from the Radziwiłł Chronicle
A page from Svyatoslav's Miscellanies (1073).
Ostromir Gospels from Novgorod, dating to 1056 or 1057
Literate 14th-century Novgorodians sent each other letters written on birch bark
Russian is an East Slavic language belonging to the Balto-Slavic branch of the Indo-European language family. It is one of the four extant East Slavic languages, and is the native language of the Russ
Old East Slavic
…was a language (or a group of dialects) used by the East Slavs from the 7th or 8th century to the 13th or 14th century, until it diverged into the Russian and Ruthenian languages. Ruthenian eventually evolved into the Belarusian, Rusyn, and Ukrainian languages. The term Old East Slavic is used in reference…
This page from an "ABC" book printed in Moscow in 1694 shows the letter П.
The Ostromir Gospels of 1056–1057 is one of many medieval illuminated manuscripts preserved in the Russian National Library.