Of course everything can be looked at from a historical point of view but this way you could turn the periodic table or the countries of the world quizzes into history ones!
There were of course many answers that I could have put in here but chose not to. In those cases it was either because a) they really had nothing to do with history at all. Mostly computer terminology or contemporary product names. or b) they were historical but just incredibly obscure.
History quiz humor
besides Xenophon, which i warmly suggest featuring, another question with X could be Xanthos (or Xanthus): one of Achilles' horses (where Achilles is as historical a charachter as Xenu, if not more).
Only downside i see is that the quiz could be too much greek-centric with these two.