Old East Slavic is an early form of the East Slavic languages, which includes modern languages like Russian, Ukrainian, and Belarusian. It was spoken from the 9th to the 13th centuries in the regions that are now Russia, Ukraine, and Belarus. This language evolved from the Proto-Slavic language and was influenced by neighboring languages and cultures. The written records of Old East Slavic primarily come from religious texts, legal documents, and chronicles. The most notable example is the Primary Chronicle, which provides insights into the history and culture of the East Slavic peoples. Over time, Old East Slavic gradually transformed into the distinct languages we recognize today.