μονογενὲς ὕπαρχον, Clem. Rom. ubi supra. Cf. Origen, contra Celsum, iv. 98: Apost. Const. V. 7: “a bird single in its kind, which they say is without a mate, and the only one in the creation.” Pseudo-Lactant. v. 30. “Hoc nemus hos lucos avis incolit unica, phœnix, Unica, sed vivit morte refecta suâ”