Wow how did I miss this thread.
This book, while I haven't read it recently, is good to have on-hand as a reference, because it tries to deal both with myth and reality and how they inter-mingled.
http://www.amazon.com/Knights-History-Legend-Constance-Bouchard/dp/1554074800
Finished this one recently. Very useful and interesting.....And horrifying.
http://www.amazon.com/The-Queens-Bed-Intimate-Elizabeths/dp/0374239789
In the midst of this one:
http://www.amazon.com/After-Black-Death-History-Interdisciplinary/dp/0253211808
I will read this one soon:
http://www.amazon.com/The-Longbow-Weapon-Mike-Loades/dp/1782000852
and I've read this one recently (or rather re-read) and, I suspect, will turn to it time and time again like I do the first one I mentioned:
http://www.amazon.com/SWORDS-AND-SWORDSMEN-Mike-Loades/dp/1848841337
This is just the stuff I've read recently. I've found many things, both non-fiction and fiction, to be of use in informing my RP. I find source material, especially non-fiction historical source material, to be essential to RP.
The key is to remember that it's only source material. It informs your RP. You can't stick to it too closely or it becomes confining. But forget the history that created the legends that UO seeks to emulate, and fantasy can spin off from reality too much.
I also want to recommend that everyone who RPs both watch and read
Lord of the Rings at least once (truthfully, in entertainment terms the movies are more successful as films than the books are as books, but the books are still good to read at least once if you're into this genre), read one or two Conan stories and/or watch the 1982 movie, read a King Arthur myth or two and/or watch
Excalibur.
-Galen's player