Tatian

Tatian of Adiabene, or Tatian the Syrian or Tatian the Assyrian, (; ; ; ; – ) was an Assyrian Christian writer and theologian of the 2nd century.

Tatian's most influential work is the Diatessaron, a Biblical paraphrase, or "harmony", of the four gospels that became the standard text of the four gospels in the Syriac-speaking churches until the 5th-century, after which it gave way to the four separate gospels in the Peshitta version. He was controversial in his own age due to his Gnostic influences, leading Russell to state Tatian "lived in the border between ortodox and Gnostic theology".