Isidore of Seville [7th century CE] (Etymologies, Book 12, 7:): The wood-pigeon [palumbes, from pabulum, ‘food’] is called a ‘chaste bird’ [avis casta] from its behavior, because it is a companion of chastity [castitas], for it is said to proceed alone after it has lost its mate, nor does it need any further carnal union. - [Barney, Lewis, et. al. translation]