The House of Bjelbo was a noble family in Sweden that played a significant role during the late Middle Ages. It originated from the region of Bjelbo in Östergötland and is best known for producing several Swedish monarchs, including King Magnus IV and King Birger. The family was influential in the political landscape of Sweden and had connections to other European royal families. The House of Bjelbo is often associated with the Valdemar dynasty, as it was linked to the Danish royal family through marriage. The family's prominence declined in the 14th century, but their legacy remains an important part of Swedish history, particularly in the context of the Kalmar Union.