A pupil of Justin Martyr.
He made a harmony of the four Gospels, the Diatessaron, attesting to the equal status they had in the church by A.D. 170.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Canon of the New Testament by Milton C. Fisher, Page 72.)