It seems like that region had a particularly high literacy rate. Texts from all classes and genders were found. The kid could have been a peasant.
https://en.wikipedia.org/wiki/Novgorod_Republic#Literature_a...
How likely is that vs works written by the rich folk survive? A cursory GPT search implies not a lot of medieval works written by poor people in general
How likely is that vs works written by the rich folk survive? A cursory GPT search implies not a lot of medieval works written by poor people in general