User blog comment:MasterBroccoli/Category Names/@comment-27274076-20170711143432/@comment-5157002-20170712053747

Well, the Roman Empire and Phoenicia pages should definitely be moved (though what they will be moved to, will depend on what we choose to do with the others).

I think the reason we add an "s" is that civiliations in all the other games have an "s" at the end. If we remove it, we'll have "Egyptians (Age of Mythology)" and "Egyptian (Age of Empires)", or "Persian (Age of Empires)" and "Persians (Age of Empires II)", which looks odd.

Personally, I prefer the pages with an "s" at the end, even though I don't think it's ever used in-game.