Birger Jarl, also known as Birger Magnusson (1210 – 21 October 1266), was a Swedish statesman, jarl, and a member of the House of Bjelbo, who played a pivotal role in the consolidation of Sweden. His first marriage was to Princess Ingeborg of Sweden, which created his base of power. Birger led the Second Swedish Crusade, which established Swedish rule in Finland. Additionally, he is traditionally attributed to have founded the Swedish capital, Stockholm, around 1250. Birger used the Latin title of Dux Sweorum ("Duke of Sweden"), and the design of his coronet combined those used by continental European and English dukes.
Birger grew up and spent his adolescence in Bjälbo, Östergötland, but the exact date of his birth remains uncertain and available historical sources are contradictory. Examinations of his mortal remains indicate that he was probably about 50 upon his dea