A friend has asked about a story that may be the academic equivalent of an urban legend. I had never heard it. I asked some journalists who cover higher education, and they also say it does not ring a bell.
But the thing sounds just plausible enough that it might really have happened. So at my friend's request, here is a call for leads in case there is anything to it.
I will avoid naming the university in question, leave gender uspecified, and say only that the events in question are supposed to have happened within the past decade. Here is the the gist of it:
A doctoral candidate has finished a dissertation based on the archives of a village in Italy. It has been accepted, the defense has gone well, and all that remains is a little paperwork. A member of the committee (or possibly just someone who knows about the dissertation topic) happens to be on vacation in Italy and decides to visit the village. It's not clear why -- curiosity, time to kill, maybe to explore the archive? In any case, it turns out there is no village.