Vistaçpa, after the appearance of Zarathrustra, which amount to 232 years, Zarathrustra would have commenced his work 1431 years before the battle of Nahavend, _i.e._ in the year 791 B.C. But who can guarantee that Cyrus, the Persian, overthrew the empire of the Medes in the year when Huma, the supposed daughter of Vohumano, died; or that Huma reigned for 30 years? How could Vohumano, the grandson of Vistaçpa, and son of Çpentodata (p. 38), have reigned 112 years, and Vistaçpa himself 90 years after the appearance of Zarathrustra? Huma is not merely a doubtful person, she is altogether fictitious. She is said to have been the mother of Darai Chirazatan, _i.e._ Darius I., and to have been called Shamirain, _i.e._ Semiramis, but her brother was the first Sassan, the ancestor of the Sassanids. As the later Arabs and Persians, including Firdousi, are no better informed,[153] we see clearly that the remembrance of the Achæmenids had almost entirely died out at the time when these writings were composed; only the name of Darius remained, and an attempt was made to connect this name with Vistaçpa by two fictitious names, Vohumano, _i.e._ the good spirit, and Huma. Besides Vistaçpa's son Çpentodata (Isfendyar) and Hutaoça, the wife of Vistaçpa, the Avesta mentions a woman, "the pure Huma,"[154] out of whom this queen must have been formed. It is clear that the tradition of the East, like the Avesta, broke off in the generation after Vistaçpa, and that in the Arabian period only the names Darai and Iskander could be placed between Vistaçpa and the Arsacids.