Who is Ragnar's revenge?
The Saga of Ragnar Lodbrok, Tale of Ragnar's Sons, and Heimskringla all tell of the Great Heathen Army that invaded England at around 866, led by the sons of Ragnar Lodbrok to wreak revenge against King Ælla of Northumbria who is told to have captured and executed Ragnar.
Does Ragnar's sons avenge his death?
After a long battle Eysteinn dies and Eric and Agnar were avenged. Ragnar is not happy that his sons have taken revenge without his help, and decides to conquer England with only two knarrs, in order to show himself a better warrior than his sons.