Tehran has been hosting communities for over 7,000 years

 

An important historical city in the area of modern-day Tehran, now absorbed by it, is known as "Rey", which is etymologically connected to the Old Persian and Avestan "Rhages".The city was a major area of the Iranian speaking Medes and Achaemenids.

 

In the Zoroastrian Avesta's Videvdad , Rhaga is mentioned as the twelfth sacred place created by Ahura-Mazda. In the Old Persian inscriptions (Behistun), Rhaga appears as a province. From Rhaga, Darius the Great sent reinforcements to his father Hystaspes (Vishtaspa), who was putting down the rebellion in Parthia (Behistun