I have always thought writers, especially non-fiction, are some of the best people to turn to when I want to learn about the past, or even the present. They offer a type of insight that isn't given in the history text books that are placed in front of us in our classrooms. I feel this mainly stems from the fact that they aren't trying to teach, they are instead reflecting what they see from the life they live in.
I learned more about WWII reading the political cartoons of Theodore Geisel (Dr. Suess) than I did in most of my history sections that covered it. I saw what people outside of the history books were thinking and feeling, not just facts recorded.
We have many great literary figures that have their place in history:
Shakespeare
Poe
Lovecraft
Virginia Wolf
Jane Austen
Plautus
Socrates
just to name a few.
However, these are ones that easily spring to mind (and of course the list could go on).
Who are some literary figures that have inspired you, enraged, caused you to think or enlightened you? It doesn't matter if they are well known or not.
After all, what is written down lives so long in our world that it's hard for it not to become a part of history. If we disappeared tomorrow and all that was left of our culture was the collective works of Jackie Collins, imagine what evidence that would leave of our society and culture!