Birger Jarl

 Birger Jarl  (c. 1200 – 21 October 1266), or Birger Magnusson, was a Swedish statesman, Jarl of Sweden and a member of the House of Bjelbo, who played a pivotal role in the consolidation of Sweden. Birger also 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 which in English equals Duke of Sweden, and the design of his coronet combined those used by continental European and English dukes.