The story has it that King Ælla killed the father of Ivar, Halfdan and Ubbe Ragnarsson by throwing him into a snake pit. Halfdan and Udde tried to avenge their father but were beaten by Ælla. In a second attack by the two brothers, some time later, Ælla was captured. It was Ivar who suggested that Ælla be killed by having the bloody eagle carved on his back.
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