He was the youngest son of Birger Jarl, the "de facto" ruler of Sweden from 1250 to 1266, and Princess Ingeborg of Sweden, daughter of Eric X of Sweden.
He was the youngest son of Birger Jarl "de facto" ruler of Sweden from 1250 to 1266, and Princess Ingeborg of Sweden, daughter of Eric X of Sweden. Birger Jarl was the.