https://en.wikipedia.org/wiki/Ragnar_Lodbrok

Ragnar Lodbrok or Lothbrok was a legendary[1][2] Viking ruler, king, and hero from the Viking Age described in Old Norse poetry and several sagas. In this tradition, Ragnar was the scourge of France and England in the 9th century and the father of many renowned sons, including Ivar the Boneless, Björn Ironside, Halfdan Ragnarsson, Sigurd Snake-in-the-Eye, and Ubba. While these men are historical figures, it is uncertain whether Ragnar himself existed or really fathered them. Many of the tales about him appear to conflate the deeds of several historical Viking heroes and rulers.

According to legend, Ragnar was married three times: to the shieldmaiden Lagertha, to the noblewoman Þóra Borgarhjǫrtr, and to Aslaug. Said to have been a relative of the Danish king Gudfred and son of the Swedish king Sigurd Hring, he became king himself and distinguished himself by many raids and conquests. There are two different accounts of his death. One is that he was seized by his foe, King Ælla of Northumbria, and killed by being thrown into a pit of snakes. His sons bloodily avenged him by invading England with the Great Heathen Army.[3] The other was that Ragnar died from a combination of cholera and wounds he sustained from trying to invade Paris.