Valdemar Magnusson

Valdemar Magnusson (c. 1285 – 1318) was a Swedish duke from the House of Bjälbo. He was the third son of King Magnus Ladulås and the younger brother of King Birger and Duke Erik.

Valdemar was created Duke of Finland in 1302. Together with his brother Erik, he rebelled against King Birger in a struggle for control of the Swedish kingdom. The brothers captured the king in 1306 in the event known as the Håtuna game, but were later forced to release him through Danish intervention. After the peace of Helsingborg in 1310, the realm was divided between Birger and his brothers, with Valdemar and Erik ruling their portion as a hereditary fief. In 1315, Valdemar and Erik partitioned their territories. Valdemar received the eastern part of the kingdom, including Stockholm and most of Finland, and established his court at Öland.

In 1317, he and his brother were seized by Birger at the Nyköping Banquet and died in captivity the following year. Their deaths led to a rebellion that deposed King Birger and resulted in the accession of Valdemar's nephew Magnus Eriksson to the throne.

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