Persepolis
Darius I built the greatest palace at Persepolis on the western side of platform. This palace was called the "Apadana". The King of Kings used it for official audiences. The work began in 518 BC, and his son, Xerxes I, completed it 30 years later. The palace had a grand hall in the shape of a square, each side long with seventy-two columns, thirteen of which still stand on the enormous platform. Each column is high with a square Taurus (bull) and plinth. The columns carried the weight of the vast and heavy ceiling. The tops of the columns were made from animal sculptures such as two-headed lions, eagles, human beings and cows (cows were symbols of fertility and abundance in ancient Iran). The columns were joined to each other with the help of oak and cedar beams, which were brought from Lebanon. The walls were covered with a layer of mud and stucco to a depth of 5 cm, which was used for bonding, and then covered with the greenish stucco which is found throughout the palaces.
Xenophon
Xenophon wrote the "Cyropaedia" to outline his political and moral philosophy. He did this by endowing a fictional version of the boyhood of Cyrus the Great, founder of the first Persian Empire, with the qualities of what Xenophon considered the ideal ruler. Historians have asked whether Xenophon's portrait of Cyrus was accurate or if Xenophon imbued Cyrus with events from Xenophon's own life. The consensus is that Cyrus’s career is best outlined in the "Histories" of Herodotus. But Steven Hirsch writes, "Yet there are occasions when it can be confirmed from Oriental evidence that Xenophon is correct where Herodotus is wrong or lacks information. A case in point involves the ancestry of Cyrus." Herodotus contradicts Xenophon at several other points, most notably in the matter of Cyrus’s relationship with the Median Kingdom. Herodotus says that Cyrus led a rebellion against his maternal grandfather, Astyages king of Media, and defeated him, thereafter (improbably) keeping Astyages in his court for the remainder of his life ("Histories" 1.130). The Medes were thus "reduced to subjection" (1.130) and became "slaves" (1.129) to the Persians 20 years before the capture of Babylon in 539 BC.