Dalam [[Prasasti Xi'an]] yang ditulis pada tahun 781 M, rahib [[Gereja di Timur|Kristen Suryani Timur]] bernama [[Adam (rahib NestoriaNestorianisme)|Adam]], penulis prasasti itu dalam [[bahasa Suryani]], menyebut bahwa kakeknya adalah seorang imam misionaris dari [[Provinsi Balkh|Balkh]], Tokharistan ({{lang-syc|ܒܠܚ|Balkh}}).<ref>{{cite book |last1=Havret |first1=Henri (1848–1901) Auteur du texte |title=La stèle chrétienne de Si-ngan-fou. 3 / par le P. Henri Havret,... ; avec la collab. du P. Louis Cheikho,... [pour la IIIe partie] |date=1895–1902 |page=61 |url=https://gallica.bnf.fr/ark:/12148/bpt6k54365345/f74.item |language=EN}}</ref><ref name=":1">{{Cite book|last1=Kurian|first1=George Thomas|url=https://books.google.com/books?id=dk4G-52QT-8C&dq=Ching%E2%80%90Ching+%28Adam%29+%28c.750+ce%28%3F%29%E2%80%93after+782+ce%29&pg=PA251|title=The Encyclopedia of Christian Literature|last2=III|first2=James D. Smith|publisher=Scarecrow Press|year=2010|isbn=978-0-8108-7283-7|pages=251}}</ref><ref>{{Cite book|last=Godwin|first=R. Todd|url=https://books.google.com/books?id=9-mKDwAAQBAJ|title=Persian Christians at the Chinese Court: The Xi'an Stele and the Early Medieval Church of the East|publisher=Bloomsbury Publishing|year=2018|isbn=978-1-78673-316-0|pages=10}}</ref>
