Haakon Magnusson was King of Norway from 1343 until his death and King of Sweden between 1362 and 1364. He is sometimes known as Haakon Magnusson the Younger to distinguish him from his great-grandfather, Haakon V. Haakon was the son of Magnus Eriksson. His older brother Eric was meant to succeed their father on the throne of Sweden, Magnus greatly favored Haakon over Eric, leading to the latters rebellion and seizure of Southern Sweden. Eric died in 1359, and Haakon became co-ruler of Sweden with his three years later. The two reigned over Sweden together until 1364, when they were deposed in favor of Magnus sororal nephew, Albert of Mecklenburg, Magnus and Haakon tried to retake the Swedish throne, but without success. In 1363, Haakon married Margaret, daughter of Valdemar IV of Denmark, the marriage, itself a significant element in the Nordic power struggle, resulted in the birth of one son, Olaf. Haakons continuous conflicts with his father-in-law ended only with the death in 1375. Haakon seized the opportunity to have his son elected Valdemars successor, upon his death in 1380, Haakon was succeeded by Olaf, with Margaret as regent. Olaf died childless seven years later, and Haakons widow proceeded to assert authority over all three Scandinavian kingdoms as their first female monarch, Haakon was born in 1340, most likely in Sweden, though the exact date and location of his birth remain unknown. He was the son of Magnus Eriksson, king of Sweden and Norway. His older brother Eric was a king of Sweden in opposition to his father between 1356 and 1359. Haakon and his family belonged to the Swedish House of Bjelbo, which had succeeded the House of Eric in Sweden. Haakon was a great-grandson of Haakon V of Norway through his legitimate daughter, Ingeborg. Another noteworthy ancestor of Haakon, through his paternal grandfather Eric Magnusson, Haakon was raised in Norway, to prepare the young prince to later rule the kingdom in his own right. During the early autumn of 1343, the most prominent members of the Norwegian Council of the Realm attended a meeting with Magnus at Varberg Castle. On 15 August 1343, letters were issued throughout Norway and Sweden stating that the King and the Council had decided to place Haakon on the throne of Norway. Barely a year later, representatives of the cities and the general public assembled at Båhus Castle, the next in line to the Norwegian throne would then be his older brother Eric and his descendants, but the provision became moot when Eric died in 1359. The meetings at Varberg Castle in 1343 and at Båhus Castle in 1344 were later ratified in another meeting in the port city of Bergen as late as 1350
The royal seal of Haakon VI
Albert Edelfelt's romanticised painting of Haakon on his mother's knee, singing the children's song "Rida rida ranka, hästen heter Blanka... (Riding a horse named Blanche...)"
Haakon's notification to Finland in 1362 of his election as King of Sweden