After-Life of Harald the Severe

This story came up to me one day about four years before yesterday. I have to accept the real and mostly true events that did happen in Paris in the year 2018. The events happened a couple of months later I wrote this fantasy! The French President was shocked himself by the events described in my book! I am sorry, dear Mr. President about those events!
What's the story about? About the long-forgotten man - the last Viking, Harald the Severe (Hardrada)

A piece of the plot itself:
"I've just woken up from the dead. I guess I've killed my wife and let her rest in peace. Before I sucked her dry, she was mumbling some crazy bullshit about my future, the world that needed me, and other creepy things. Let her get away! She had a peeve with me and my beaten head for the whole of my life! And now I've drunk her life and blood till the last drop. I hate them both! Why am I fucking alive?"
"I can now see my future. I will follow the right path. But for me, it won't be a path. It will be a highway as I am the king!"
"I don't want to have a total monopoly. I want to be free. Why can't I?"
"I must make everyone believe me! And then I have to betray them all. There will be no road for me but a path. The miserable end awaits anyway! Let it be if that's God's will!"