He and his companions Huisheng, Fali, and Zheng or Wang Fouze left the Wei capital Luoyang on foot in 518 and returned in the winter of 522 with 170 Buddhist scriptures. Song and Hui's accounts of their journey are now lost but much of their information was preserved in other texts.

Life

Knowledge of Song Yun's bibliography is known primarily from sources derived from the accounts of the journey written by

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