Sweden's colonisation efforts focused on the Finnish archipelago and some of its coastal regions and brought Swedish-speakers to Finland.
[1][2] The reason behind the colonisation was the pursuit of the Roman Catholic Church to spread its faith to pagan lands around the Baltic Sea.
Besides the Catholic Church, the colonisation was supported by the still primal Swedish Kingdom who granted four years of tax exemption to any Christian Swede who settled the areas of Southwest Finland, Uusimaa, Åland, Tavastia or Satakunta.
[5] The native inhabitants in many coastal areas also lost their fishing and farming rights, which led to conflicts.
[7] As a result of the colonisation, some of the pagan inhabitants who refused to receive the new Catholic religion from Tavastia and Satakunta started to move to the northern parts of Finland.