Eastern Sassanian Iran, what is now solely composed of Afghanistan and
Central Asia, was predominantly Buddhist.
For this purpose,
al-Mansur founded a palace library, modeled after the Sassanian Imperial Library, and
provided economic and political support to the intellectuals working there.
During the Sassanian era, the name of the city was Ram Ardashir
and later become Reyshahr, eventually this turned in to Bushehr, which is the current name of the city.
The Abbasid dynasty had a strong Persian bent, and adopted many practices from the Sassanian Empire- among those,
that of translating foreign works, except that now texts were translated into Arabic.