A musical interval spanning four tones or an ancient church composition (especially an early Christian gospel harmony) combining four related texts.
From Greek 'dia' (through) + 'tessara' (four), literally meaning 'through four.' Historically, it refers to Tatian's 2nd-century work harmonizing the four gospels into one narrative.
Tatian's Diatessaron was Christianity's first attempt at creating a unified gospel narrative—in essence, an ancient fanfiction writer combining four separate stories into one, which became so popular it nearly replaced the original four gospels in some Middle Eastern churches.
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