I know this isn't exactly what "AskHistorians" is designed for but I figured what better place to get recommendations than from people just as interested as my friend. He truly loves the roman empire and I was wondering if any of you had a recommendation for what I could get him.
As a general rule, historians love books -- and this one, if he hasn't read it already, is a great text for someone who loves Rome: https://www.amazon.com/SPQR-History-Ancient-Mary-Beard/dp/1631492225
Beyond that, it's hard to give advice without knowing him. Possible gifts could include books, movies, documentaries, games, jewelry and other reproductions, militaria, or real (or replica) Roman coins.
I'm personally always fond of reproduced artefacts, and you can get pretty much anything depending on his taste. For myself, the perfect gift would be some reproduction Roman pottery or glass -- but I'm always looking for something cool to eat or drink out of, and other people like other sorts of things so it's difficult to advise without really knowing him.