- See Ray, Iran for the city of Ray, south of Tehran.
Located in the Arjan (ارجان) region, the city was also called Riu-Ardashir (ریو اردشیر).
In particular, some historians such as Yaqut al-Hamawi's Mu'jam Al-Buldan write of the city being centered on a pre-Islamic academic center of higher learning where scholars converged to study medicine as well as Indian and Greek sciences.
- Tārīkh-i ʻulūm va adabīyāt-i Īrānī (تاریخ علوم و ادبیات ایرانی). Safa, Ẕabīḥ Allāh (ذبیح الله صفا). Perry-Castañeda Library. OCLC number 6899380 1969.
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