Sigurd. While all of Ragnar's sons are capable fighters, Sigurd is definitely the weakest of the five - and seems to be a fairly average Viking fighter, rather than someone who stands out as a Son of Ragnar.
Ivar The Boneless
Ivar was terrifying and cruel, but a weak man he was not. Everyone underestimated him and he knew it, so he used it to his advantage.
Of all the Ragnarssons, Ivar the Boneless is easily the most dangerous. As strategic as he can be on and off the battlefield, his anger and violent rage have proven to blind him to reason at times. The final scene Ivar shares with Ragnar is credited as the true birth of Ivar the Boneless.
Ivar, the eldest and cleverest, is their leader and he installs himself at Lejre. As Ragnar does not want his sons to overshadow him, he appoints Eysteinn Beli as the king of Sweden and tells him to protect it from his sons.
Though he ended up leaving Kattegat with just Ivar by his side, star Travis Fimmel thinks everything worked out the way Ragnar wanted. "His relationship with Ivar I think it's his favorite relationship," Fimmel told IGN on a visit to Vikings' set.
But in the very end, it was obvious that Ragnar and Lagertha never loved anyone else as much as they loved each other. So much they loved each other that they were obviously soulmates as evidenced in so many different scenes.
Fans feel Ubbe is Ragnar's best son
Many Vikings fans on Reddit believe that Ubbe, Ragnar's first son with Aslaug, is his best son because he has all of Ragnar's best attributes and few of his worst.
Perhaps the epitome of the archetypal bloodthirsty Viking, Erik the Red violently murdered his way through life. Born in Norway, Erik gained his nickname most likely due to the colour of his hair and beard but it could also reflect upon his violent nature.
With the show's highest kill count, Rollo takes the crown as Vikings' deadliest warrior, possessed of an unmatched fierceness and ferocity. Bjorn was a beast in battle, but Rollo was something else entirely. Throughout his life, Rollo struck fear into the heart of an enemy shield wall.
The love and friendship between Ragnar and Athelstan were so special that it made Floki jealous, so much so that he ended up killing Athelstan in Vikings season 3. Athelstan's death had a big impact on Ragnar as he lost the only person he could trust, marking the beginning of his downfall.
Ragnar Lodbrok is considered to be the most famous Viking by many historians and the wider public. This is largely because of his lead role in the History Channel show, Vikings. However, he also had a prominent role in many Viking sagas that detailed his raids on what is now France and England.
Björn Ironside, according to Norse legends, was a Norse Viking chief and Swedish king. According to the 12th- and 13th-century Scandinavian histories, he was the son of notorious Viking king Ragnar Lodbrok and lived in the 9th century, between 855 and 858.
He also appears in Norse legends, and according to the legendary sagas Tale of Ragnar's Sons and a Saga about Certain Ancient Kings, Ragnar Lodbrok's father has been given as the legendary king of the Swedes, Sigurd Ring.
And if his death has disappointed many fans, it's still one of the most emblematic moments of the TV series. Ivar made a surprising decision in the Vikings series finale, sacrificing himself in order to save the life of his brother Hvitserk. He is then killed by a Wessex soldier during the show's last epic battle.
Several years later, Ragnar left for Denmark to fight in a civil war. Saxo recounts that Ragnar was still annoyed with Lagertha for having set beasts on him, so he divorced her and married Thora Borgarhjört, the daughter of the king of Sweden. They had several children together.
Ivar grew up unable to walk and had to be carried everywhere on poles or on the back of a shield.
No matter how brilliant a tactician Ivar the Boneless was, there's little doubt that Bjorn was a better overall fighter - it's even in his name, as he was dubbed 'Ironside' due to his seeming inability to be killed or harmed in battle.
Ragnar Lothbrok is the hero of the epic The Saga of Ragnar Lothbrok and is considered an amalgam of a number of Viking chieftains.
Lagertha. Thanks to Saxo Grammaticus' Gesta Danorum, we know of a legendary female Viking known as either Lagertha or Ladgerda. This incredible woman was part of a larger group of female warriors who volunteered to help renowned hero Ragnar Lothbrok avenge his grandfather's death.
The Viking reputation as bloodthirsty conquerors has endured for more than a millennium but new research shows that some Norsemen approached the British islands with more than a little trepidation.
Among the English court, Earl Godwin is one of the bravest, in large part because he has had to make up for his own father's misdeeds and mistakes in his own pursuit of power and influence at the court of the king.
Lagertha, according to legend, was a Viking ruler and shield-maiden from what is now Norway, and the onetime wife of the famous Viking Ragnar Lodbrok.
Ragnar said he loved Ivar as much as Aslaug, to which Aslaug replied he did not act like it. Ivar later was brought to Floki by Aslaug to be mentored in the path of a Viking, with Aslaug intending for her son to hate the Christians. Floki seems to bond with Ivar, as they are fellow outcasts.
Ragnar Lothbrok and Lagertha shared a deep relationship that defined their entire lives. How the two met is unclear, but it is alleged that Ragnar, whilst on his way to confess his love to her, had to spear a bear and strangle a hound in order to reach her. Lagertha, impressed, agreed to marry him.