Yes, I knew that much about Richard III. But after reading your comments and others on this most interesting thread, I want to learn more. :-)
There are many books on him and some splendid novels. Try Paul Kendall’s early bio which is beautifully written. Avoid Starkey, Jones, some of Baldwin because they are not experts in Yorkist history. Their degrees are in Tudor history. Ross is not a Ricardian but he is a Yorkist historian. Annette Carson is one of the best and I recommend her “Maligned King.”