Most Greek and Latin manuscripts of the four gospels contain divisions into longer or shorter sections, which can be collocated in parallel columns to reveal synoptic correspondences. These are called “,” since Eusebius* of Caesarea attributes to Ammonius of Alexandria an edition of Matthew containing parallel passages from the remaining three gospels in the margin. Eusebius himself numbered the sections and arranged them into his ten “canons.” This Ammonius (c.220?) was neither the Neoplatonist philosopher nor the commentator on Daniel, John, and Acts. It is uncertain how far Eusebius himself was responsible for the divisions.