Diatessaron

The Diatessaron (c 160–175) is the most prominent Gospel harmony created by Tatian, an early Christian apologist and ascetic. The term "diatessaron" is from Middle English ("interval of a fourth") by way of Latin, diatessarōn ("made of four "), and ultimately Greek, διὰ τεσσάρων (dia tessarōn) ("out of four"; i.e, διά, dia, "at intervals of" and tessarōn, "four"). Tatian combined the four gospels—Matthew, Mark, Luke, and John—into a single narrative.