Dathevatsi, Gregory an Armenian theologian, who lived in the middle of the 14th century, was monk in a monastery at Dathey. After having studied under the celebrated John Orodnetsi, he taught theology and philosophy. He died in 1410, leaving about twenty works, of which the best known is a Book of Questions, printed at Constantinople, and held to be heretical.
There was also another Gregory Dathevatsi, who was martyred. in the 17th century by the Kurds; and this one, according to the opinion of Serpos, is commemorated in the Armenian liturgy. See Hoefer, Nouv. Biog. Generale, q.v.