Ivar the Boneless (Old Norse: Ívarr hinn Beinlausi; born 800s–died 873), also known as Ivar Ragnarsson, was a Viking leader who invaded England. According to Tale of Ragnar Lodbrok, he was the son of Ragnar Loðbrok and his wife Aslaug. His brothers included Björn Ironside, Halfdan Ragnarsson, Hvitserk, Sigurd Snake-in-the-Eye and Ubba. While the sagas describe Ivar's physical disability, they also emphasise his wisdom, cunning, and mastery of strategy and tactics in battle.