Even if we assume it rightfully belongs to people with Roman ancestry, that describes many modern Germans as well as it does modern Italians. People from these two regions were moving around and in near constant contact with each other for thousands of years. Somebody who is German today may have ancestors who were Italian two hundred years ago, and Greek 2000 years before that.

Which part of Rome? It depends. It doesn't make sense to send the Roman baths in England back to Italy for example.

I dunno, maybe some historians would know the best place to return it?