Jarl Olavsonn was the acting chieftain of York placed in charge by Ivar the 'Boneless'. King Harald offered him a chance to raid Wessex and overthrow Ivar in Kattegat. Olavsonn agrees to his terms. 

Upon arriving in Wessex , the Viking army is severely defeated at the battle of Marton , in which Olavsonn is killed, being struck by two arrows. 


Season five appearances
The Departed Part 1 The Departed Part 2 Homeland The Plan The Prisoner
The Message Full Moon The Joke A Simple Story Moments of Vision
The Revelation Murder Most Foul A New God The Lost Moment Hell
The Buddha The Most Terrible Thing Baldur What Happens in the Cave Ragnarok
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