Alright- so no name in return. Given his immediate jump to violence, there were a number of explanations possible for that, and Gretel wasn't about to push any of them too far, too soon. His quip about the Rhine pricked at her senses in a peculiar manner, namely his tone. It didn't sound like he was referencing a place he'd never been, but only knew through some vague fault of meager education- the kind she would have expected from someone dressed as he was and talking about Romans. Perhaps it went deeper.
"I was born twenty leagues from it's shore, south of the Black Woods." She purposefully used the archaic names for the biggest landmarks- ones that possibly would have been known to his time. A guess, maybe, but an educated one. She went on. "The Rome as you know it was sacked and burned for good, nearly thirteen hundred years in my past. This place is three hundred years in my future... Look."
Slow enough to make a point that she wasn't going for anything dangerous, Gretel fished her communicator device from a pouch at her hip. She showed it too him, hitting the small button that brought the screen to bright life with her thumb.
"You have one of these on the table beside your bed. We all have one. It's called a phone- a modern invention that connects your voice and words to others trapped in this place."