Bjelbo

The House of Bjelbo took its name from its manor at Bjälbo in Östergötland and supplied Sweden's jarls and bishops of Linköping. Folke the Fat became the first known Swedish jarl around 1100; the family held the office until its abolition in 1266.

Birger Jarl's son Valdemar was elected king in 1250 when Eric XI died without an heir, but his brother Magnus Ladulås deposed him in 1275. The house ruled Sweden until 1364, when Magnus Eriksson was driven out by Albert of Mecklenburg, and through Magnus it also held Norway from 1319 to 1387.

Olaf, king of Denmark and Norway, was its last reigning monarch when he died in 1387. The last male of the line followed within a few years. Euphemia of Sweden was an ancestress of the Oldenburg kings, while Gustav Vasa descended from an illegitimate branch.