A close-up of part of the stairway up to the Apadana A fire-altar with the relief of a Magus, a member of the Zoroastrian priestly tribe—the Magi (From Kayseri, Turkey) North of Persepolis three and a half miles rises a rock cliff (Naqsh-i Rustam). Four tombs of Persian kings were cut into the side of the cliff. Inscriptions identify one of them as the tomb of Darius I. The others are thought to belong to Xerxes, Artaxerxes I, and Darius II. (For more on this topic, go to p. 304 or p. 347.)