The following is a comment on the famous "cat, rat, dog," rhyme about Richard III which is used as a chapter title in PoA. Sir Francis Lovell, for those of you who don't know, is the "dog" from that rhyme.
I wanted to point out that Lovell (the dog), also, mysteriously disappeared at the end of the battle of Stoke in 1487, claimed slain by his enemies.
The story continues that Lovell went back to his family home and hid himself in a secret room. Supposedly, either through his own fault or through the treachery of his servants, he was accidentally stuck in the secret room-- he could not get out.
In the 1700s, Lovell's (or what was supposedly Lovell's) body was found in the secret chamber, huddled over some papers-- he had apparently been writing something. But when the chamber was opened, the papers were destroyed.