Tahran is a city or town in the Azadi Empire (presumably on the Far Western continent). One of the soldiers at night in Marcuria says to April: "I wonder what my betrothed is doing right now. She lives in Tahran. She told me she'll wait for me, even though I'll be here for many years." This name was undoubtedly inspired by the real-world Tehran: capital of Iran. This is just one of many Persian-influenced aspects of the Azadi, among their architecture, theocracy, and the name 'Azadi' itself.