Why take offense, Patrick? I'm not saying that there is no parapsychology. As far as I'm concerned, I know that there is a whole lot about humans that we Don't know.
However, I do know that people have hallucinations and they might see anything from cats and white mice to toy soldiers and Napoleon. It is part of many mental health problems and can also be evoked by alcohol, medications and recreational, illicit drugs. The experience of a hallucination makes people say that they think they see is real.
When a whole village starts to see Romans though, I agree with you, that this would not be explained by hallucinations and probably falls more into the realm of parapsychology.
There's a very good fictional account of a quest for the lost standard of the 1X Hispana. It's called "The Eagle of the Ninth" and is by Rosemary Sutcliffe.The son of a centurion who disappeared with the legion up in my Scottish homeland goes in search of his father and to learn the fate of the unit.