This document summarizes key Persian rulers from Cyrus the Great to Darius III. It notes that Cyrus defeated the Medes to gain control of the Persian Empire and allowed conquered lands to keep their customs and religions. It then outlines the reigns and accomplishments of subsequent rulers like Cambyses II, Darius I, Xerxes, Artaxerxes, Darius II, Artaxerxes II, Artaxerxes III, and Darius III, including their military campaigns, revolts they faced, and how they came to and lost power. The Persian Empire declined during this period with rebellions and foreign invasions until its final defeat by Alexander the Great under Darius III