In the form which Firdusi has given them, the legends of Ancient Iran have to some extent continued to live among the people, and to some extent they have failed. The Shahnameh celebrates Jemshid's (Yima's) glittering palace and splendid throne; hence the ruins of the great palace of the Achæmenids at Persepolis have gained the name of the throne of Jemshid; ruins near Bamiyan in the Hindu-Kush, on the road from Balkh to Cabul, are still called Zohak's castle. The smoke rising out of the crater of Demavend is the breath of Zohak chained in the depths of the mountain. Each year, on the last day of August, the inhabitants of Elburz celebrate the festival of the overthrow of Zohak with bonfires on every height, and demonstrations of joy. The ruins of Takt-i-Bostan are called the garden of Kai Chosru, and in Iran Balkh is still the mother of cities.[441] A lofty and steep rock in Lake Zirreh in Sejestan is said to have been crowned with the castle of Rustem, and the site of a second castle is pointed out at Aivan. Aqueducts and dams pass for works of Rustem. In the desert of Beluchistan, the ancient Gedrosia, the tracks of the camels of Rustem are still shown by large stones in the sand. In Mazanderan is the battle-field where Rustem defeated the Divs in order to liberate Kai Kaus (p. 253). The sculptures of the Achæmenids on the tombs at Persepolis are called pictures of Rustem (Naksh-i-Rustem), and in the bed of the Hilmend his grave is shown. When Timour's Mongols devastated Sejestan in the fourteenth century, the people called on Rustem to raise his head from the grave, and behold Iran in the hand of his enemy, the warrior of Turan. By a strange misconception the nobles in Mazanderan assume the name Div as a title of honour. A large family of nobles in Sejestan call themselves Kaïanids, and boast of their descent from Jemshid and the ancient kings, and to this family, down to the most recent times, the viceroyalty of Sejestan belonged as an hereditary office. When the holder of it died, the eldest of the family went to court in order to apply for the office, and was duly installed by investment with the robe of honour and armour.[442]