I found some questions about or related to ancient-Iran and think it can be an appropriate guide for users who are searching this category of questions. I don't have enough reputations to create it myself. Could you add it yourself?
Persia is a synonym for Iran not a synonym for ancient-Iran because it is a name and maybe many people who come here in a willing to find for ancient-Iran questions cannot find it and Persia makes them confused as it refers to the old name of Iran not the whole ancient history behind this name. As you know Persia refers to a part of ancient Iran from Sassanaid empire and not refer to some hundred years before it.
I added ancient-Iran and suggested the Persia as a synonym of Iran. It seems more rational.