Hermas in Smiths Bible Dictionary

(Mercury), the name of a Christian resident at Rome to whom St. Paul sends greetings in his Epistle to the Romans. Ro 16:14 (A.D. 55.) Irenaeus, Tertullian and Origen agree in attributing to him the work called The shepherd. It was never received into the canon, but yet was generally cited with respect only second to that which was paid to the authoritative books of the New Testament.