However, the oldest Persian document on Iran shows that the city existed before the third century AH because an author called “Abu Sa’d Sam’ani” has mentioned a man called “Abu Abdollah Mohammad ibn Hamed Tehrani Razi” who has lived in Tehran and Rey and has passed away in about 261 AH or 874 AD
Aboleshaq Estakhri has given a detailed report on Tehran in his book, Al-Masalik wal Mamalik, in 340 AH. Ibn Balkhi has explained about Tehran in his book, Farsnameh, which he has written in about 500 AH.
Najmeddin Abu Bakr Mohammad ibn Ali ibn Soleiman Ravandi has noted in his famous book, Rahat us-Sudur (authored in 599 AH) that the mother of Sultan Arsalan Seljuk, who was going from Rey to Nakhichevan in 561 AH, stopped near Tehran while Sultan was residing in Doulab region, which was located southeast of Tehran.
The area between the southern hills of Alborz and the northern parts of Kavir Desert is relatively smooth and very fertile which extends from east to west. This region has been among the most important centers of population and one of the main routes connecting the east to the west. Therefore, the city of Rey and its perimeter up to a radius of about 100 km has been the birthplace of one of the most important human civilizations which has been known as “Central Iranian Plateau Civilization” and dates back to more than 8000-12000 years ago.
دوری که در او آمدن و رفتن ماست
او را نه بدایت نه نهایت پیداست
کس می نزند دمی در این معنی راست
کاین آمدن از کجا و رفتن به کجاست
