When you get right down to it, all history, whether written by the winners or the losers, is fiction. Aside from pinning a date to an event or producing written documentation, there is little else that anyone can say, unless in autobiography, about anyone's motivations, and even there we have to consider the source. So, unless you're planning a career as an historian, you might as well stick to actual fiction.
Once upon a time I thought that perhaps I might have a career as an historian, so I've read lots and lots of actual histories. But you know what I remember? These: Read more about How To Read History