The Birkebein Party or Birkebeinar (Old Norse: Birkibeinar; Norwegian: Birkebeinarane (nynorsk) or Birkebeinerne (bokmål)) was the name for a rebellious party in Norway, formed in 1174 around the pretender to the Norwegian throne, Eystein Meyla. The name has its origins in propaganda from the established party that the rebels were so poor that they made their shoes of birch bark. Although originally a pejorative, the opposition adopted the Birkebeiner name for themselves, and continued using it after they came to power in 1184.
Today, the Birkebeins are popularly celebrated for having escorted the two-year-old Haakon Haakonsson, an heir to the Norwegian throne, to safety from Lillehammer to Østerdalen to Trondheim, a long and perilous journey through treacherous mountains and forests. This is commemorated through cross-country ski races Birkebeinerrennet and Birkebeinerrittet, as well as the American Birkebeiner and Canadian Birkebeiner.
The Civil war era in Norway (borgerkrigstiden) is a term used for the period between 1130 and 1240 in the history of Norway. During this period there were several interlocked conflicts of varying scale and intensity. Although weak in the beginning, the Birkebeiners had the upper hand in the for most of the conflict's duration. King Haakon IV was the ultimate victor for the Birkebeiners in 1217. In the earlier part of the reign of King Haakon, much of the royal power was in the hands of Skule Bårdsson. In 1239, the conflict between the two erupted into open warfare, when Skule had himself proclaimed king in Nidaros. The rebellion ended in 1240 when Skule was put to death.