The Finnish–Novgorodian wars were a series of conflicts between Finnic tribes in eastern Fennoscandia and the Republic of Novgorod from the 11th or 12th century to early 13th century. The wars' effect on the Finns' society contributed to the eventual Swedish conquest of Finland in around 1249. The term used in Russian chronicles to refer to Novgorod's enemy, Yem, is highly obscure and probably referred to several different groups. Some of the groups identified as Yem may have been the inhabitants of Tavastland in south-central Finland, the West Finns in general, or a sub-group of Karelians on the northern coast of the Ladoga.