Hanged on a tree. — Were crucified; a common punishment among the Persians, especially on rebels (Herod. iii. 120, 125, 159, &c). The dead body of Leonidas was crucified by Xerxes’ orders after the desperate stand at Thermopylæ.
Book of the chronicles. — A sleepless night of Xerxes accidentally brought this matter, after it had been forgotten, before the king’s mind. Herodotus often refers to these Persian Chronicles (vii. 100; viii. 85, 90).