Researchers found his body on an imperial Roman estate and took dental samples. Why examine teeth? Well, the water you drink at birth leaves a distinct signature in your teeth. That water signature is in the form of oxygen isotopes, atoms of oxygen with different numbers of neutrons. Isotopes say something about the latitude and elevation of your birthplace—which in the case of our mystery man definitely wasn’t southern Italy.
Then the researchers tested his mitochondrial DNA, which is passed down through your maternal lineage. And this fellow had east Asian genes.
Link | Photo: Indiana University
This should come as no surprise, really. There were very ancient trade routes way before that.
Also, I wouldn't be concerned about the water. None of the water we drink is %100 H2O. We'd be pretty sorry if it was. It's just different depending on the wheather, soil, and society.