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When safely back at Kattegat with King Horik, Ragnar only trusts those who stood by him.
As Princess Aslaug journeys to Kattegat, Ragnar allies himself with King Horik in the battle with Jarl Borg.
Justice is dealt to Jarl Borg, and allies are made on both sides of the sea.
Ragnar receives an unexpected offer from King Horik and Lagertha's new husband doesn't seem overly pleased to see her. Meanwhile, Athelstan becomes King Ecbert's trusted aide.
While the raids on Wessex continue, Ragnar attempts to rule in the west. Meanwhile, King Ecbert faces a new kind of enemy and Jarl Borg makes his own plans for Kattegat.
When a paranoid Earl Haraldson learns from a seer that Ragnar wants him dead, he orders Ragnar's farm and home burned to the ground.
The Viking army attacks Paris as the city musters its forces for defense.
Earl Haraldson allows Ragnor to return to England, where an explosion of violence and mayhem are unleashed onto the unsuspecting town of Hexam.
Lagertha is once again reunited with Ragnar and Bjorn make another choice. Meanwhile, Athelstan finds it difficult to define his faith and Aslaug has to accept the consequences of her prophecies.
While Ragnar meets Ecbert in search of a compromise, Rollo must lead his people. Meanwhile, Jarl Borg imposes a strict rule on Kattegat.
Horik and Ragnar travel to Wessex, but their true purpose is disputed. Meanwhile, Princess Aslaug's prepares to give birth.
When Ragnar discovers that Earl Haraldson ordered Rollo's torture, a confrontation between the two men is inevitable.
As Ragnar sails three ships towards King Aelle, he offers peace in exchange for ransom.
Four years have passed and Ragnar leads a new series of raids on England.
While a plague ravages the village of Kattegat, Ragnar sets off towards Götaland, where he must settle land dispute with Jarl Borg.
Athelstan comes to realise just how strong his Christian faith remains, when he accompanies Ragnar and Lagertha on the traditional Viking pilgrimage to Uppsalla.
Ragnar's invading party are met with extreme violence when they march on King Ecbert's villa.
A monastery in Lindesfarne is the first victim to Ragnar and his men.
As Ragnor prepares for his first journey into the unknown Western lands, the suspicion and paranoia of Earl Haraldson escalates.
As Ragnar prepares to take his troops for one more daring attack on Paris, he makes a request of his son that could change the future of the Vikings for ever.
While Rollo worries about the Seer's prophecy, the Vikings make final preparations for their raid on Paris.
An alliance angers Floki; Princess Kwenthrith makes political moves.
King Ecbert proposes a deal to the Vikings in the Season 3 premiere. Later, Ragnar leads his forces into battle.
The populace of Paris is in a panic after the appearance of the Viking fleet, and Emperor Charles, at the behest of his daughter, announces he'll remain in the city.
Tragic circumstances greet the fleet on its return to Kattegat; Lagertha is usurped and convinces Ragnar to help her reclaim her title.
It is 793 AD and Viking warrior Ragnar Lothbrok wants to go to the West in search of riches, rather than following the old tradition of raiding the East. However, getting the permission of Head Man, Earl Haraldson, is not going to be easy.
As the new Viking settlement prepare for their first harvest, King Ecbert pays them a visit.
As a second assault on Paris is being prepared, Emperor Charles must make a difficult decision. Meanwhile, in Wessex, Judith must make her own difficult choice.
A mysterious wanderer arrives in Kattegat; Lagertha and Athelstan establish a Viking settlement.
As they near Paris, the Vikings relaunch their boats, but this time they bear interesting structures made by Floki; Aethelwulf and Alfred arrive in Rome, where honors are bestowed by Pope Leo IV, but in Wessex, relations are less than cordial between King Ecbert and a disgruntled King Aelle.
In the 10th episode (mid-season finale), victory proves costly in the battle between the Vikings and the French as Ragnar squares off against Rollo, sealing the fates of the two brothers.