Originally Posted by sun surfer
I would not use the term "prologue" in a TOC for an epigraph; it's not the same thing. Nor would I go with "preface" or really any of the others for the same reason.
In my opinion, it's an epigraph, so if you're going to have it labelled in a TOC, that's the appropriate word to use.
+1. In fact, if I were reading a book where the TOC listed an epigraph as a prologue, I'd be pretty put off, because I'd worry that if something that insignificant and easy to research is wrong, there might be significant research issues involved in the story as well.
Though, I can't recall ever reading a book that actually listed the epigraph in the TOC. I've got quite a few books that have epigraphs on the "Part one" "Part two" etc. pages of multi-volume novels, but the TOC lists those as "Part one" "Part two" etc. with the epigraph as a nice bonus when you actually get there.