What happens in Revenge?
Spoilers for this episode and earlier events.
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat. Æthelwulf confronts Ecbert over his treatment of him before accepting responsibility for defense. In Northumbria, Ælle’s force is defeated, and Ragnar’s sons execute the captured king by blood eagle.
- Season & episode
- Season 4, episode 18 of 20
- Series order
- 47 of 89
Story connections: Bjorn Ironside, Ivar the Boneless, Ubbe and Hvitserk.
Identify a face in this episode.
Episode references: HISTORY season guide · Community episode record.

Key events and consequences
Defeating Ælle fulfills a named act of vengeance but does not supply the coalition with a common plan afterward. The disagreement over command exists before that victory. Harald's hidden move toward Kattegat shows that participation in the same army can coexist with preparing to seize an ally's home.
- Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat.
- Æthelwulf confronts Ecbert over his treatment of him before accepting responsibility for defense. In Northumbria, Ælle’s force is defeated, and Ragnar’s sons execute the captured king by blood eagle.
Key characters

Bjorn Ironside
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat.
Character story
Ivar the Boneless
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat.
Character story
Ubbe
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat.
Character story
Hvitserk
Character story
King Harald Finehair
Æthelwulf confronts Ecbert over his treatment of him before accepting responsibility for defense. In Northumbria, Ælle’s force is defeated, and Ragnar’s sons execute the captured king by blood eagle.
Character story
Floki
Character story
King Ecbert
Æthelwulf confronts Ecbert over his treatment of him before accepting responsibility for defense. In Northumbria, Ælle’s force is defeated, and Ragnar’s sons execute the captured king by blood eagle.
Character story
Margrethe
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat.
Character storyEgil
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat.
Character storyLocations and story geography
Northumbria
Ælle's defeat and execution turn the brothers' promise of vengeance into a completed act.
Kattegat
Egil's infiltration prepares a separate struggle for power behind the campaigning army.
These are places in the story. For the real landscapes used on screen, explore the filming-location guide.
The episode breakdown
What changes in this episode
Bjorn and Ivar disagree over command. Ubbe marries Margrethe, while Harald encounters Ellisif and learns she has married another man. Harald and Halfdan arrange for Egil to infiltrate Kattegat. Æthelwulf confronts Ecbert over his treatment of him before accepting responsibility for defense. In Northumbria, Ælle’s force is defeated, and Ragnar’s sons execute the captured king by blood eagle.
Why it matters — original analysis
The title names an objective that appears capable of ending a story, but the episode surrounds its fulfillment with ambitions it cannot satisfy. Harald’s pursuit of status meets a refusal that conquest has not prevented. The brothers’ shared target does not settle who should lead them. Æthelwulf also faces the problem of being needed by someone whose love and respect he questions. Across these strands, recognition is demanded through service and violence, yet neither provides a reliable guarantee of receiving it.
Rewatch focus — original analysis
The blood eagle is a screen event within this drama; the guide does not present it as proof of how the historical Ælle died. Keep the landing, the battle and the execution distinct. Their different scales show how a public campaign is brought to bear on an intimate account of a father’s death.
Themes to follow
- vengeance fulfilled
- status and humiliation
- violence as obligation
The history behind this episode.
Was Ragnar Lothbrok a real person?
The familiar Ragnar gathers several kinds of material into one life. Later legends and the historical campaigns associated with men claimed as his sons do not establish the television biography.
Keep the distinctionRead the family on screen as drama; investigate a named person, campaign or source separately.