Tehran is in the historical Media region of ( ) in northwestern Iran. By the time of the Median Empire, part of present-day Tehran was a suburb of the prominent Median city of Rhages ( ). In the Avesta's ''Videvdat'' (i, 15), Rhages is mentioned as the 12th sacred place created by Ohrmazd. In Old Persian inscriptions, Rhages appears as a province (Bistun 2, 10–18). From Rhages, Darius I sent reinforcements to his father Hystaspes, who was putting down a rebellion in Parthia (Bistun 3, 1–10). Some Middle Persian texts give Rhages as the birthplace of Zoroaster, although modern historians generally place the birth of Zoroaster in Khorasan Province.