showing forest burning The origin of the Forest Finns lies in border skirmishes since the 13th century. The powers to the east of
Finland,
Novgorod and later Russia, constantly challenged the Swedish sovereignty of the often sparsely populated provinces of Eastern Finland. To secure their realm, the Swedish kings, notably
Gustav Vasa ( 1523–1560) and
Eric XIV ( 1560–1568), encouraged farmers to settle these vast wilderness regions, which in turn were used to the traditionally slash-and-burn agriculture. These settlements faced several problems, from conflicts with the original populations of
Sami people and
Karelians to harsh conditions living in frontier lands during war times. The fact that slash-and-burn itself requires a relatively low human population density or a continuing supply of new "frontier" lands, also caused overpopulation and by the late 16th century
forced migration by Forest Finns from
Savonia () and Northern
Häme (
Tavastland). The main part of the Forest Finns moved north to
Ostrobothnia (
Österbotten) and
Kainuu ('
), east towards northern Karelia ('), and south towards
Ingria (
Ingermanland) (part of Sweden at the time, now part of Russia). However, an estimated 10–15% went westbound across the
Baltic Sea in search of largely uninhabited lands best fit for their needs. The first Forest Finns' settlements in
Sweden Proper were established in
Norrland, in the provinces of
Gästrikland,
Ångermanland and
Hälsingland in the 1580s and 1590s. Another migration route started from
Medelpad and continued through the early 17th century on crown lands in the provinces of
Dalarna,
Värmland and
Dalsland, among others, to occupy the areas immediately adjacent to the border with
Denmark–Norway. Eventually, from the 1620s on, the Forest Finns began settling to Norway. There, they settled in the Eastern counties of
Hedmark,
Oppland,
Akershus,
Oslo and
Buskerud. The largest concentration of settlements, however, was in the forest-rich eastern part of Hedmark, close to the border of Sweden, in what today is denoted as
Finnskogen in
Norwegian and
Finnskog[arna] in
Swedish (literally "Finn Forest[s]"). In this rather remote region the Forest Finns were able to move back and forth between the two countries. The border was not properly established until 1751. In April 1823, six Swedish and six Norwegian Forest Finns traveled to the capital
Stockholm in what was called "Tolvmannamarsjen" (English: The march of the twelve men). They brought a petition with 600 signatures demanding their own common church congregation (Kirkesogn) with a Finnish speaking priest right on the
Norway-Sweden border. The twelve men were given an audience before King
Charles XIV John on 4 May. ==Contemporary acceptance==