When you're a screenwriter working on a film, you're not really even welcome on set, even if you know... When I wrote 'Elizabeth' and Shekhar Kapur was a friend of mine, but I wasn't really welcome on set, because the director is God and it's a very difficult position for a screenwriter who's put so much passion into that, into the writing.
I got interested in the Vikings, and then you realize that there isn't much to be read about them because they did not write their history. It was written by hostile witnesses, by Christian monks and so on. From what I could see and understand, I was really excited about it. I loved their culture and loved their gods.