Considering that a lot of classic fantasy genre tropes come from this period and region of history, perhaps that is a bit of an oversight on my part, one that reading Iggulden's Wars of the Roses series has helped me address. In fact, reading these books, combined with some thinking I've been doing recently about plotting, has led me to some interesting reflections. So while this is still a review of the series, I also want to talk a little about those thoughts.
What is the modern fantasy genre may arguably be said to have been derived from historical fiction. After all, much of classical fantasy was derived from the myths and legends of times gone by, and for a long time (arguably to this day), fantasy was significantly stuck in twelfth century Europe. The genre has since expanded far beyond those historical beginnings, with subgenres like alternative world fantasy that are set in completely different universes, with their own laws of physics, and with characters that sometimes aren't human at all. However, given that heritage, it perhaps should not be terribly surprising that a historical fiction novel about the Wars of the Roses would read more like fantasy than anything else.