Susa was an ancient city in the lower Zagros Mountains about 250 km (160 mi) east of the Tigris, between the Karkheh and Dez Rivers in modern day Iran. One of the most important cities of the Ancient Near East, Susa served as the capital of Elam and the winter capital of Achaemenid Empire, and remained a strategic centre during the Parthian and Sasanian periods.

Elam (; Linear Elamite: hatamti; Cuneiform Elamite: 𒁹𒄬𒆷𒁶𒋾 ḫalatamti; Sumerian: 𒉏𒈠 elam; Akkadian: 𒉏𒈠𒆠 elamtu; Hebrew: עֵילָם ʿēlām; was an ancient civilization centered in the far west and southwest of modern-day Iran, stretching from the lowlands of what is now Khuzestan and Ilam Province as well as a small part of southern Iraq. The modern name Elam stems from the Sumerian transliteration elam , 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, a name derived from its capital Susa.