The Persian Empire was a vast empire that spanned from India to Africa under the rule of powerful leaders like Cyrus the Great and Darius I. Cyrus established policies of tolerance and allowing conquered peoples to maintain local customs, which helped the empire thrive. However, over time weaker rulers like Xerxes took power and imposed harsher policies. The empire also declined due to military defeats by Alexander the Great, social unrest over high taxes, and economic problems as rulers prioritized hoarding wealth over circulation.