Eusebius of Dorylaeum
Eusebius Of Dorylaeum, born at the end of the fifth century, began his public life as a lawyer, and obtained the place of imperial commissioner (agens in rebus). Evagrius (Hist. Ecclesiastes 1:9) says of him that, "while still practising as a rhetorician, he was the first to expose the blasphemy of Nestorius." It seems to have been he who interrupted Nestorius in a sermon about A. D. 430 (when he denied to Mary the title θεοτόκος), by crying aloud, "No, the eternal Logos himself subjected himself to a second birth." This, at least, is the conclusion of Neander (Church History, Torrey's transl., 2:504). He also thinks it probable that Eusebius was the author of the formal complaint publicly posted against Nestorius in the church of Constantinople, comparing him to Paul of Samosata (Neander, 1.c.). It is possible that it was as a reward for this zeal that he was made bishop.
At all events, he entered into orders, and became bishop of Dorylaeum, in Phrygia. In the year 448, at the Home Council (σύνοδος ἐνδημοῦσα), held at Constantinople, he entered complaint against Eutyches (whom he had previously warned privately), as holding false and blasphemous doctrines, contrary to the fathers, as to the person of Christ (Mansi, Concil. 6:495, 650). SEE EUTYCHES. At this synod Eutyches was condemned, but in the next year, at the Robber-Council, SEE EPHESUS, ROBBER-COUNCIL OF, Eutyches was restored, and Eusebius condemned and deprived of his see. When he attempted at this council to explain the doctrine of two natures in Christ, voices exclaimed, "Burn Eusebius! As he has cut Christ asunder, so let him be cut asunder." He fled to Rome. The tide was turned by the death of Theodosius, A.D. 450. Leo the Great, bishop of Rome, prevailed upon Marcian, the successor of Theodosius, to convene another general council, which met at Chalcedon A.D. 451, and Eusebius was restored to his see. A few polemical writings of Eusebius are still extant, as Consertatio adversus Nestorium (in the works of Marius Mercator, 2, page 18): — Libellus adversus Eutycheten (in; Labbe, volume 4, page 151): — Libellus adversus Dioscurum (ib. volume 4, page 380): — Epistola ad Marcianum imperatorem (ib. page 95). — Neander, Ch. Hist. 2:505-513; Hoefer, Nouv. Biog. Gener. 16:777.