Новгородская первая летопись
The archaeological excavations in Novgorod and Staraya Russa unearthed over a thousand of birch bark manuscripts, used mostly to document various business issues. Currently, these manuscripts serve as the main source on the everyday life in the ancient Russia. Many medieval chronicles originate from Novgorod, the first one being the Novgorod First Chronicle, which covers the period between 1016 and 1471. In 14th century the Slavic-Nordic pirates Ushkuiniks spread in the Russian north and later in many other regions of ancient Russia.