writer of the primitive church in the second century. He was born in Assyria, and trained up in the heathen religion and learning. Coming over to Christianity, he became the disciple of Justin Martyr, whom he attended to Rome. While Justin lived, he continued steadily orthodox; but after Justin's death, he made a schism, and became the author of a new sect, condemning marriage, enjoining abstinence from wine and animal food, and suffering only water to be used in the holy mysteries; whence his followers were called Encratites and Hydroparaglatae. None of his works are now extant but his piece against the Gentiles; or, as it is usually entitled, his Oration to the Greeks.

Tatius, Achilles, a native of Alexandria, was the author of a book on the sphere, which Father Petavius translated into Latin. There is also attributed to him a Greek romance on the loves of Leucippe and Clitophon, of which Salmasius has given a beautiful edition in Greek and Latin, with notes. Suidas says, that this Achilles Tatius was a Pagan, but that he afterwards embraced the Christian religion, and became a bishop. Photius mentions him in his Bibliotheca.

Tattonneur. See Lemur, Mammalia Index.