High Middle Ages

===Scandinavia===
{{main|History_of_Denmark#Middle_Ages|History_of_Norway#Middle_Ages|Early Swedish history|l1 = Denmark in the Middle Ages|l2 = Norway in the Middle Ages|North Sea Empire}}

From the mid-10th to the mid-11th centuries, the Scandinavian kingdoms were unified and Christianized, resulting in an end of [[Viking]] raids, and greater involvement in European politics. King [[Canute the Great|Cnut]] of Denmark ruled over both England and Norway. After Cnut's death in 1035, England and Norway were both lost, and with the defeat of [[Valdemar II of Denmark|Valdemar II]] in 1227, Danish predominance in the region came to an end. Meanwhile, Norway extended its Atlantic possessions, ranging from [[Greenland]] to the [[Isle of Man]], while Sweden, under [[Birger Jarl]], built up a power-base in the [[Baltic Sea]]. However, the Norwegian influence started to decline already in the same period, marked by the [[Treaty of Perth]] of 1266. Also, [[Civil war era in Norway|civil wars raged in Norway]] between 1130 and 1240.