Новгородская первая летопись
Throughout the Middle Ages, the city thrived culturally. A large number of birch bark letters have been unearthed in excavations, perhaps suggesting widespread literacy. It was in Novgorod that the Novgorod Codex, the oldest Slavic book written north of Bulgaria, and the oldest inscription in a Finnic language (Birch bark letter no. 292) were unearthed. Some of the most ancient Russian chronicles (Novgorod First Chronicle) were written in the scriptorium of the archbishops who also promoted iconography and patronized church construction. The Novgorod merchant Sadko became a popular hero of Russian folklore.