Achaemenid Empire and Elam

The Achaemenid Empire (, ə-KEE-mə-nid; Old Persian: 𐎧𐏁𐏂, Xšāça, lit. 'The Empire' or 'The Kingdom') was an ancient Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. At peak, its territorial extent was roughly 5.5 million square kilometres (2.1 million square miles), making it the largest empire of its time. Based in the Iranian plateau, it stretched from the Balkans and Cyrenaica in the west to the Indus Valley in the east, including Anatolia, Cyprus, Mesopotamia, the Levant, the South Caucasus, parts of Eastern Arabia, and large parts of Central Asia.

Elam was an ancient civilization centered in the far west and southwest of Iran, stretching from the lowlands of Ilam and Khuzestan as well as a small part of modern-day southern Iraq. The modern name Elam stems from the Sumerian transliteration elam(a), along with the later Akkadian elamtu, and the Elamite haltamti. Elamite states were among the leading political forces of the Ancient Near East. In classical literature, Elam was also known as Susiana (US: UK: ; Ancient Greek: Σουσιανή Sousiānḗ), a name derived from its capital Susa.