Ancient Persia was a powerful empire that existed from around 550 BCE to 330 BCE, primarily located in what is now Iran. It was founded by Cyrus the Great, who united various tribes and established a vast territory that stretched from the Mediterranean Sea to the Indus River. The empire is known for its advanced administration, road systems, and respect for local customs. The Achaemenid Empire is the most notable dynasty of ancient Persia, which included famous rulers like Darius I and Xerxes I. The empire was known for its impressive architecture, including the grand city of Persepolis, and for the development of the Royal Road, which facilitated trade and communication across the vast region.