::It's not being replaced by a disambiguation page. It's being replaced by a short article explaining the meaning of the umbrella term "Persian Empire". Britannica calls this an "historical empire from about 550 BC-640 AD", i.e. from the Achaemenids to the Sassanids. We already have articles on those states, as well as the intervening Seleucid Empire (Graeco-Macedonian/Hellenistic) and Arsacid Empire (Parthian - Iranian but not strictly speaking Persian). The summary version of all this history is at History of Iran.