 It is not clear when the "Chronicle of Seert" was written.It cannot have been written earlier than the ninth century, as at one point in the text the author quotes the Nestorian patriarch Ishoʿ Bar Nun (823-4).Some scholars believe that the "Chronicle" is the work of the ninth-century author Ishoʿdnah of Basra, who is known to have written a three-volume ecclesiastical history.