Bjorn the feisty

Bjorn Ironside is a legendary viking who in the stories surrounded himself with his brothers and his father, the viking chieftain Ragnar Lothbrok. On their adventures, it was his crippled brother Ivar who lead the gang, while Bjorn was described as a capable and ferocious warrior who with his bravery and abilities can turn the tide of battles. His nickname seems to be quite literal and refers to the strength of his sides, which were like iron, thus Bjorn Ironside. 

While the legends mentioning Bjorn are set in the 9th century CE, they are mostly known from three sources, all from around the 13th century CE: The Saga of Ragnar Lothbrok, The Tale of Ragnar's Sons and Saxo Grammaticus' Gesta Danorum.