Sources : Turtledove

Aelianus [170-230 CE] (On the Characteristics of Animals, Book 10, chapter 33): I have stated earlier on that the turtle-dove is continent and does not, from a desire for some strange and alien bed, consort with any other mate than the one it originally joined. - [Scholfield translation]

Saint Ambrose [4th century CE] (Hexameron, Book 5, chapter 19.62): It is related that the turtle dove, when widowed by the loss of her consort, was 'utterly weary of the bridal-bed' and even of the world itself, for the reason that 'her first love, turning traitor, cheated her by death.' He was regarded as unfaithful from the point of view of perpetuity and as dour in respect to beauty in that he had created more pain as a result of his death than sweetness from his love. Therefore, she renounces any other marriage alliance and does not break the laws of chastity or her pledges to her beloved, reserving for him alone her love, for him alone cherishing the name of wife. - [Savage translation, 1961]

Augustine [5th century CE] (City of God, Book 16, chapter 24): Turtledoves seclude themselves from the busy conversation of men.

Isidore of Seville [7th century CE] (Etymologies, Book 12, 7:60): The turtle dove (turtur) is named from its call; it is a bashful bird, always dwelling in mountain heights and desert wildernesses. It flees human homes and interaction, and dwells in forests. - [Barney, Lewis, et. al. translation]