(Ἀρταΰντη), a daughter of Masistes, the brother of Xerxes I. Xerxes gave her in marriage to his son Dareius, but he himself was in love with her, and on one occasion was obliged, by his own imprudent promise, to give her a robe which he had received as a present from his wife Amastris. Thus the king's paramour became known, and Amastris, fancying that the love affair was the work of the wife of Masistes, took the most cruel vengeance upon her. (Hdt. 9.108_110.) Maximus Tyrius (26.7) confounds the two women, Amastris and Artaynte. (Comp. Tzetz. Chil. 2.6.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890