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Properly most of you never heard of him, although you may have read about from a book but forgotten. He was the founder of the capital of Sweden/Stockham and led the second crusade which ruled Finland for 550 years, and possibly responsible for helping Russia conquered Novgorod Republic, he also married the Danish queen dowager, Matilda of Holstein.
http://en.wikipedia.org/wiki/Birger_Jarl
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