Oh, I guess you're right. I never thought of it that way, because I usually know the time era when I decide to read historical fiction. I also love how you're like, 'Nero had AN affair'. Like... one of MANY. Many. I totally get what you're saying here, though. I do agree having some semblance of reader surprise is also good to have. So, maybe just list who the character is and why they are important?