Why don't you write a love story with a Targaryen daughter and Ivar the Boneless? I think you should write it. For example, as an example idea, you know the Game of Thrones story. Daenerys Tageryen was being married by Viserys Tageryen. In order to become king, let them have one more sister in your story. Let this sister run away from free cities to find Daenerys while she wants to get married. One of them should be kidnapped, he should be taken captive by the vikings, he should adopt Helga and Floki, he should reveal his prophetic abilities and sorcery abilities, just like the queen Aslaug, during the adoption process, he should be trained by Aslaug with his beauty, intelligence, wisdom and being a soothsayer, let him be a virgin warrior by Lagertha, he will have 4 stones with him in this process. Let the hatched dragon eggs be found next to him, and in the following days, when Aslaug tries to be killed by Lagertha, the Tageryen daughter protects him, they run away together, but even though Lagertha trains him, he falls for his betrayal and is found by his men and burned alive. You determine the course of the story?