Hmm, that does seem hard to justify. Maybe she could be some sort of massive history nerd and be somewhat obsessed with Caesars mimicking of Ancient Rome, I honestly can't think of one at the moment, that's pretty freaking hard. I'm not a huge fan of the Legion, or specifically Caesar under my normal male circumstances but other people around here have probably been in the same situation as you though, they should be able to offer far better ideas.