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In page Tehran:

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Another theory is that "Tehran" derives from Tiran/Tirgan, "the abode of Tir", the Zoroastrian equivalent of Hermes. The ancient Parthian town of Tiran had a neighbour, Mehran ("abode of Mehr/Mithra", the Zoroastrian sun/justice angel). Both of these were mere villages in the suburbs of the great city of Ray/Rhages. Mehran still exists as a residential district in Greater Tehran, as well as Ray, which forms the southern suburbs of Tehran.[citation needed]