The Birkebein Party or Birkebeinar 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.

Haakon IV Haakonsson, sometimes called Haakon the Old in contrast to his namesake son, was King of Norway from 1217 to 1263. His reign lasted for 46 years, longer than any Norwegian king since Harald Fairhair. Haakon was born into the troubled civil war era in Norway, but his reign eventually managed to put an end to the internal conflicts. At the start of his reign, during his minority, Earl Skule Bårdsson served as regent. As a king of the Birkebeiner faction, Haakon defeated the uprising of the final Bagler royal pretender, Sigurd Ribbung, in 1227. He put a definitive end to the civil war era when he had Skule Bårdsson killed in 1240, a year after he had himself proclaimed king in opposition to Haakon. Haakon thereafter formally appointed his own son as his co-regent.