'Vikings' does not just deal with wars and powers, but also the emotional lives of the characters.Facebook/Vikings

The latest instalment of "Vikings" will focus on the personal lives of Ragnar and Rollo. They become overwhelmed by the domestic strife in Season 4 Episode 4 titled "Yol."

[Spoiler Alert]

In the upcoming episode of the historical drama, Ragnar (Travis Fimmel) welcomes a guest to Kattegat. Bjorn (Alexander Ludwig) travels to his residence, but the timing of his arrival couldn't be worse. In the promo for Episode 4, Ragnar and his wife Queen Aslaug (Alyssa Sutherland) are seen fighting over their son Ivar. Ragnar's enemies seem to be increasing as the season progresses, and the latest video clip suggests that his status at home is also under threat.

In the preview clip, Ragnar tries to force his son to partake in the Christmas festivities, but his offspring remains defiant. In this tense moment, Queen Aslaug tells him, "He's different. You can't make him what you want. You can't make him like you ... he's not you."

Ragnar reminds Queen Aslaug that Ivar is his son too and that he loves his child. His wife shoots back saying, "You don't act like it." Her anger perhaps stems from the fact that her husband becomes close to Yidu, the foreign slave in Kattegat.

Meanwhile, Rollo (Clive Standen) will face his own    problems in Frankia. The fate of marriage to Princess Gisla (Morgane Polanski) remains uncertain as she requests for a divorce from her pagan husband. Rollo's marriage cements his political ambition. What will he do to secure his future?

The promo captures the Viking warrior tearing off his arm ring and giving it to his wife in order to declare the importance of their marriage. He says, "This means something to me. This is personal. Do it what you will."

Season 4 Episode 4's synopsis released on TV Guide reads:

"A Norwegian king and Bjorn, who is accompanied by a new partner, are welcomed to the Great Hall in Kattegat; King Aelle arrives at Wessex for Christmas and is unimpressed with the development of family relations. Meanwhile, in Paris, Rollo's future depends on whether he can win over his new bride, as a papal delegation arrives to arrange a divorce."

"Vikings" Season 4 Episode 4 airs Wednesday, 10 p.m. EST on History Channel. You can live-stream the episode via History Channel's website.