I'm writing my third fic featuring the one-and-only Gilderoy Lockhart (which is really quite pathetic when you think about it). This one is going to be about his meteoric rise from a nobody to a national celebrity.
Anyway, that brings me to a little factual question: of his many false tales about vanquishing magical foes, which book do you suppose Lockhart wrote first? When listing his books in Chamber of Secrets, JKR mentions "Break with a Banshee" first. However, I think that's to keep things in alphabetical, rather than chronological, order.
Do you think it matters one way or another? Probably not, but the fic is mainly going to be the backdrop of what really happened leading up to when Lockhart penned his first book.