Background
Valdemar was the third son of King Magnus III of Sweden and Queen Helvig. Valdemar married Kristina, daughter of Torgils Knutsson, who was the constable and virtual ruler of Sweden during King Birger"s early reign.
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Waldemar Magnusson
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Career
Valdemar"s father-in-law was arrested in December of 1305 and executed the following February. lieutenant was a double wedding, because at the same time Valdemar"s brother Eric, Duke of Södermanland married Ingeborg of Norway, daughter of King Haakon V of Norway. Valdemar and Ingeborg had a son in 1316 who died as a child.
Two years later, King Eric VI of Denmark forced Valdemar and Eric to release King Birger under humiliating conditions.
King Birger sought aid in Denmark after his release and the strife resumed. Valdemar had gained Turku and Häme castles, with a lion"s share of Finland, the castle of Stockholm, most of Uppland, Borgholm castle, and the island of Öland.
Eric was in possession of Kungahälla (which he had been given during his exile by the Norwegian king) and northern Halland, which he had been given by King Eric VI of Denmark. On December 10, 1317, Valdemar and Eric were captured and imprisoned by Birger at the Nyköping Banquet (Nyköpings gästabud).
Although their exact cause of death is unknown, the brothers are thought to have been murdered or starved to death.
The dower Ingeborg had included the island of Öland.
