Diatessaron

Diatessaron (pronounced dahy-uh-tes-er-uhn)

(1) In theology, a conflation of the four Gospels of the Bible (Matthew, Mark, Luke, and John) into a single narrative.

(2) In the musical notation of Ancient Greek music, the interval of a fourth (obsolete).

(3) An electuary compounded of four medicines (obsolete).

1375-1400: From the Late Latin, from the Ancient Greek dia tessarōn khordōn sumphōnia (concord through four notes), the construct being διά (diá) (composed of (literally through)) + τεσσάρων (tessárōn) (every fourth).  Tessárōn was the genitive plural of τέσσαρες (téssares) (four).  Diatessaron is a noun; the noun plural is diatessara or diatessarons.

In Europe, the word was for centuries used as a technical term in music meaning "interval of a fourth" and in 1803 it was adopted in theological publishing to describe the harmonizing of the four biblical gospels, something done informally for centuries.  The use in the early medicinal preparations began with apothecaries defining certain electuaries as diatessarons if they were made from four base ingredients but the use soon faded.  An electuary is any medicine mixed with honey or other sweetener in order to make it more palatable to swallow and is from the Late Latin electuarium (of unknown origin but likely a corruption of the Ancient Greek ἐκλεικτόν (ekleiktón) (medicine that melts in the mouth; medicine which can be licked-up; lozenge, jujube) from ἐκλείχω (ekleíkhō) (to lick up; I lick up), the construct being ἐκ (ek) (out, from) + λείχω (leíkhō) (I lick)).

Folio 4v of the Rabula Gospels (Florence, Biblioteca Mediceo Laurenziana) Canon Tables.

The Christian New Testament begins with the story of Jesus rendered as  four versions of the story of Jesus, each more or less complete. These accounts of Jesus’ life, the gospels (meaning “good story”), are each named after its purported author, Matthew, Mark, Luke and John and each relates a narrative of the life of  Jesus and his ministry, all in in theological terms. Three of these gospels (Matthew, Mark and Luke) are very similar, and are referred to as the Synoptic Gospels; John is quite different.  In academic theology, The Diatessaron is described as “a harmonized gospel”, a text created by taking the four “standard gospels” and weaving them into one story.  Medieval scholars believed there was one original Diatessaron written during the second century by an individual named Tatian but it’s long been thought most probable that several gospel harmonies (or Diatessarons were) created between the second and fourth centuries and in one form or another, the Diatessaron was one of the pre-eminent Gospel texts in the Syriac-speaking churches of the east until the fifth century when, under the influence of the western church which maintained the tradition of four separate gospels, the harmonized versions began to be supplanted by the four.

Despite that change (which spread with typical efficiency in the institutional Church), the Diatessaron remained for centuries a document of importance to individual Christians and even some clerics, despite the loss of canonical status.  Speculation has long surrounded to origin of the Diatessarons for there exists no documentary evidence.  Most scholars seem to believe the motives of the early authors were pragmatic, a single text more suitable to use a teaching device to a population which was substantially unschooled and often illiterate.  There was also some sensitivity to the criticism from Christianity’s early enemies which focused often on the inconsistencies between the gospels, each difference in detail seized upon as might a barrister in cross-examination highlight contradictions in the evidence offered by a witness.  As a literary device, the concept of harmonization was anyway accepted and known since Antiquity and scholars had even then known the four individual gospels had themselves been harmonized from earlier texts.  Moreover, the Gospels are interpretive texts, drawing and editing passages from the Hebrew Bible to support the veracity of their narrative, citing those texts as required so structurally, harmonization is a form of interpretation.  To understand the extent to which the Diatessarons might be thought of as cross-cutting interpolations (and certainly not deconstructions) of the four gospels, they're best viewed in tabular form, the columns arranged spreadsheet-like.  Dr Naomi Koltun-Fromm (b 1964) of Haverford College, Pennsylvania has written a fine piece using this format.