Новгородская первая летопись
Most of the historical sources mentioning Finns are the Finnish-Novogorodian wars described mainly in Novgorod First Chronicle and in the Primary Chronicle. Some of these conflicts are also described in Sofia First Chronicle, Nikon Chronicle and in Laurentian Codex. Finnic groups and the Republic of Novgorod waged a series of wars between the 11th and 14th centuries. They probably contributed to the Finns' eventual subjugation to the Catholic Church and the Kingdom of Sweden.