Ragnar (Travis Fimmel) has led an adventurous life. He transformed from a modest farmer into a powerful king, raided Paris and earned the fame and notoriety of a great warrior. But even so, the infamous Ragnar Lothbrok has some regrets about his life, which he divulges in episode 5 of the History Channel series “Vikings.”

The King of Norway explains to Bjorn (Alexander Ludwig) in the Season 4 installment that one of his qualms revolves around being a poor family man and father figure.

“It is not easy behind a father. It is even harder at being a husband. Maybe I have failed at both,” Ragnar says before whispering to his son. “No, I have definitely failed at being a husband.”

But that wasn’t the last time Ragnar shared a secret of his. During a heart-to-heart with Yidu (Dianne Doan), who reveals she was the daughter of the Chinese emperor, Ragnar unveils his greatest shame revolves around the death of innocent people.

According to the king, he feels responsible for the slaughtering of his people after they were brutally murdered in a vicious attack while he was away.

“I live with such guilt,” Ragnar say, “and nobody knows.”

However, unlike his father, Ivar (James Quinn Markey) is quite relentless and seems to lack morals. In episode 5, titled “Promise,” Ragnar’s young son commits a heinous crime, which ultimately gets covered up by his smothering mother Queen Aslaug (Jessica Sutherland).

While Floki (Gustaf Skarsgård) was teaching Ivar the history of his people, Aslaug notices that her son wants to go out and play. So she grants him permission to put his studies to the side. But soon Ivar goes from having fun to feeling frustrated when he learns he is the monkey of the childish game monkey in the middle. When he finally gets a grip on the toy, a young boy tries to rip it out of his hands, which is when Ivar strikes the child down with a blunt object, knocking him out dead.

“Do not be afraid,” Aslaug says as she coddles her screaming son. “It is not your fault.”

Ivar isn’t the only one to drop jaws in episode 5. When the installment kicks off, fans watch as Lagertha (Katheryn Winnick) teaches her shieldmaidens how to fight, presumably for the impending raid on Paris. However, audiences later learn their lessons were to protect Lagertha for when she become the new Earl of Hedeby.

Lagertha tells Kalf (Ben Robson) she is pregnant in episode 5, which prompts him to ask for her hand in marriage. She agrees and plays the part of a blushing bride until moments before the ceremony, which is when she sticks a knife into her husband-to-be. She then announces to her people that she is the only Earl they will have. That’s when her shieldmaidens surround her with their weapons and new training.

With Kalf dead, Erlendur (Edvin Endre) better watch his back — especially now that Bjorn is on his scent. Torvi (Georgia Hirst) reveals to Bjorn in episode 5 that the ring he’s toying with happens to belong to the father of her child.

“He got it from his father, King Horik (Donal Logue),” she says, revealing to Bjorn who had hired to Berserker to kill him.

“Vikings” airs Thursdays at 10 p.m. EDT on the History Channel.