The Diatessaron

TheDiatessaronwas used as the standard Gospel text in the liturgy of at least some sections of theSyrian Churchfor possibly up to two centuries and was quoted or alluded to by Syrian writers.Ephrem the Syrianwrote a commentary on it, the Syriac original of which was rediscovered only in 1957, when a manuscript acquired by SirChester Beattyin 1957 (now Chester Beatty Syriac MS 709, Dublin) turned out to contain the text of Ephrem's commentary. The manuscript constituted approximately half of the leaves of a volume of Syriac writings that had been catalogued in 1952 in the library of the Coptic monastery of Deir es-Suriani inWadi Natrun, Egypt. Subsequently, the Chester Beatty library was able to track down and buy a further 42 leaves, so that now approximately eighty per cent of the Syriac commentary is available (McCarthy 1994).