The conversation between human and AI assistant.
[|Human|] When did Iranians convert to Islam?
[|AI|] Unlike the popular opinion that Arabs converted Iranians to Islam after defeating the Sasanian Empire, Iranians continued to practice their native religions for many centuries. The conversion to Islam was a slow process which was aided by differentiated tax systems for Muslims and non-muslims.
[|Human|] 
When did Iranians convert to Islam?