This book fills an important gap in Achaemenid studies by using traditional Iranian narratives, such as those found in the famous Shahnameh, or 'Book of Kings', of Ferdowsi, to analyse the Greco-Roman accounts of Median and Persian royalty. The study shows that the classical authors derived their accounts from Iranian traditions, grounded in age-old myths and legends. This analysis serves many purposes. It refines the extent to which the classical sources may be used in historical reconstructions and sheds new light on the literary methods of authors, such as Herodotus, Ctesias, and Xenophon. Finally, the book offers insights into one of the thorniest enigmas in Iranian historiography, the apparent disappearance of Illustrious rulers like Cyrus II, Darius I, and Xerxes I from native historical traditions. Standing at the crossroads of Iranian studies and Classics, this book is an indispensable source for scholars of ancient Iran, Greek historiography, and the Shahnameh.