Ammianus Marcellinus Res Gestae val2.12.62

[62] A certain man died, leaving a wife and a little son who did not know his mother. Her son, when a small boy, was taken from her by some one, carried to another province, and there brought up. When he became a youth, he somehow returned to his mother, who had now become betrothed to another man. When the mother saw her son, she embraced him, thanking God that she had seen her son again, and he lived with her for a month. And behold! the mother’s betrothed came, and seeing the young man, asked who he was. She replied that he was her son. But when her betrothed learned that the youth was her son, he began to ask the return of the earnest-money ¹ and to say: Either deny that he is your son, or I certainly depart hence. The mother yielded to her betrothed and began to deny her son, whom she herself had before acknowledged, saying: Leave my house, young man, since I took you up as a stranger. But he kept saying that he had come back to his mother and to the house of his father. To make a long story short, while this was going on the son appealed against his mother to the king, who ordered her to appear before him. And he said to her: Woman, your son appeals against you; what have you to say? Is he your son, or not? She replied: He is not my son, but I took him up as a stranger. And when the woman’s son had told the whole story in order to the king, he again said to the woman: Is he your son, or not? She said: He is not my son. The king said to her: How much property have you, woman? She replied: As much as a thousand gold-pieces. And when the king declared with an oath that he would not make anyone else than the young man himself her husband, and that she should receive no other husband, then the woman was disconcerted and confessed that the young man was her son. ² And there are many other things told of the king.