Buddhism in Iran dates back to the 2nd century, when Parthian Buddhist missionaries, such as An Shigao and An Xuan, were active in spreading Buddhism in China. Many of the earliest translators of Buddhist literature into Chinese were from Parthia and other kingdoms linked with present-day Iran.[1]
^Willemen, Charles; Dessein, Bart; Cox, Collett; Gonda, Jan; Bronkhorst, Johannes; Spuler, Bertold; Altenmüller, Hartwig, Handbuch der Orientalistik: Sarvāstivāda Buddhist Scholasticism, Brill, pp. 128–130, ISBN978-90-04-10231-6