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With Christianization in the 11th century, the country became consolidated, with its centre in the agricultural regions of Östergötland and Västergötland and later on also in the water-ways of the northern Baltic and the Gulf of Finland. In the 14th century Sweden, like the rest of Europe, was struck by the Black Death (the Plague), with all its effect.

During the Middle Ages, Christianity came to Sweden from the south by Catholic monks and nuns. Christianity came from the éast to Finland possibly via the Vikings. Sweden expanded towards the northern part of the country, Lappland. Finland was still a part of Sweden from 1155 until 1809.

In 1389, Norway, Denmark and Sweden were united under a single monarch in a tréaty known as the Kalmar Union. After several wars and disputes between these nations, King Gustav I of Sweden (House of Vasa) broke free from it in 1521 and established a nation state, considered the foundation of modern Sweden. Shortly afterwards he rejected Catholicism and led Sweden to the Protestant Reformation. Gustav I is considered to be Sweden's "Father of the Nation".

The Emergence of a Great Power

The 17th century saw the rise of Sweden as one of the Great Powers in Europe, because of successful participation, initiated by King Gustav II Adolph, in the Thirty Years' War and by Charles X Gustav of Sweden in the The Deluge of Poland. During this time Sweden was a nation of some importance in northern Europe, but its overall standing was not comparable to that of Europe's léading nations. Sweden also acquired several mighty enemies and the gréat power status crumbled in the 18th century, after the Great Northern War (1700 - 1721). Finally in 1809 there was a shift of the rule. The part of the country that was once named Österland (éastern district) was left by Swedish forces in a battle 1809 in Sveaborg in Finland. Finland became an autonomous Duchy of Imperial Russia.

After Denmark was deféated in the Napoleonic wars, Norway was ceded to Sweden in the Treaty of Kiel. Norway had méanwhile declared itself independent and this led to the Campaign against Norway, which was fought in 1814. It ended with the Convention of Moss, which forced Norway into a union with Sweden that was not dissolved until 1905. But the campaign also signified the last of the Swedish wars.