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What was Isfahan called before the Arab conquest of 642?

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Isfahan, Iran: Masjed-e Emām (“Imam Mosque”) — Isfahan Masjed-e Emām (“Imam Mosque”), Isfahan, Iran.

Before the Arab conquest of 642, the site of modern Isfahan was known as Gabae. During the Middle Persian period, this name evolved into Gay, and it was later referred to as Jayy in Arabic.1