 Among Christian's works is the commentary "Expositio in Matthaeum Evangelistam" ("Commentary on the Gospel of Matthew"), in which he discussed (among other things) the eschatological implications of portions of that Gospel.The traditional date given for the composition of this work is 864; however, some scholars have questioned this and maintained that Christian actually lived decades earlier.Multiple manuscripts have survived of Christian's commentary on Matthew the Evangelist's gospel, some of which were likely edited by later writers to conform with their own views.