China, Silk Road, Zoroastrianism

It co-existed with Buddhism to the point that some of its priests participated in the translation of Buddhist scriptures into Chinese
Along with Zoroastrianism and Manichaeism, Nestorian Christianity was recognized in Tang China as one of the “three foreign religions”, thereby banned in the “Anti-Buddhist” movement of 845 CE.
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http://hist48t-fall2009.blogspot.com/2009/12/lecture-24-november-2009.html