Tacitus - (Tragic circumstances of Radamistus and his wife, Zenobia)
The Annals, Book XII (109 A.D)

Rhadamistus had no means of escape but in the swiftness of the horses which bore him and his wife away. Pregnant as she was, she endured, somehow or other, out of fear of the enemy and love of her husband, the first part of the flight, but after a while, when she felt herself shaken by its continuous speed, she implored to be rescued by an honourable death from the shame of captivity. He at first embraced, cheered, and encouraged her, now admiring her heroism, now filled with a sickening apprehension at the idea of her being left to any man's mercy. Finally, urged by the intensity of his love and familiarity with dreadful deeds, he unsheathed his scymitar, and having stabbed her, dragged her to the bank of the Araxes and committed her to the stream, so that her very body might be swept away. Then in headlong flight he hurried to Iberia, his ancestral kingdom. Zenobia meanwhile (this was her name), as she yet breathed and showed signs of life on the calm water at the river's edge, was perceived by some shepherds, who inferring from her noble appearance that she was no base-born woman, bound up her wound and applied to it their rustic remedies. As soon as they knew her name and her adventure, they conveyed her to the city of Artaxata, whence she was conducted at the public charge to Tiridates, who received her kindly and treated her as a royal person.