From https://en.wikipedia.org/wiki/Björn_Ironside Björn Ironside[a] was a Norse Viking chief and legendary king of Sweden, who appears in Norse legends. According to the 12th- and 13th-century Scandinavian histories, he was the son of notorious Viking king Ragnar Lothbrok. He lived in the 9th century, being securely dated between 855 and 858.[1] Björn Ironside is said to have been the first ruler of the Swedish Munsö dynasty. In the early 18th century, a barrow on the island of Munsö was claimed by antiquarians to be Björn Järnsidas hög or Björn Ironside's barrow.[2][3] Medieval sources refer to Björn Ironside's sons and grandsons, including Erik Björnsson and Björn at Haugi.[4] His descendants in the male line supposedly ruled over the Swedes until c. 1060.