Ivar the Boneless Ragnarsson was a semi-legendary Viking warrior who invaded a significant portion of Ireland and England in the 9th century. According to Viking Age traditional literature, he was the leader of the massive Norse army that invaded Britain in 865. He is believed to be the oldest son of Ragnar Lothbrok, the near-mythical Danish and Swedish Viking hero and ruler, and his third wife, Aslaug. Some sagas claim that Ivar was born with certain physical deformities but as he grew up alongside his brothers and half-brothers, he quickly proved himself to be the most intelligent and ruthless among them. As an adult, he led his siblings to raids on Zealand, Reidgotaland, Gotland, Öland and all the minor islands. After his half-siblings were killed by a king of Sweden, he led an attack on the country. Following the death of his father, he and his siblings amassed a large army to invade England and punish the man responsible, Ælla, the king of Northumbria. They went on to defeat Ælla and subjected him to the execution technique of “blood eagle.” Later, he also fought battles against the Kingdoms of Mercia and Wessex. Many historians regard him identical to Imar, the founder of Uí Ímair dynasty.