The Median hegemony (late 7th-early 6th century BCE) emerged in the aftermath of the Bronze Age Collapse (circa 1200 to 1150 BCE) and, more directly, the disintegration of the Neo-Assyrian Empire (to 612/609 BCE). Under rulers such as Cyaxares (reign circa 625–585 BCE), Median power expanded across the Iranian plateau and into eastern Anatolia, contributing to the final defeat of Assyria in alliance with the Neo-Babylonian king Nabopolassar (reign 626–605 BCE). In the west, Lydia consolidated control under Alyattes (reign circa 619–560 BCE), while in Mesopotamia the Neo-Babylonian Empire (626–539 BCE) dominated the Fertile Crescent from the Levant to the Tigris and Euphrates.

Median authority, however, was not expressed through continuous territorial administration but through a shifting network of alliances, tribute relations, and regional influence. While Median power extended toward the Caucasus, the Caspian basin, and eastward into regions later known as Parthia, Aria, and Bactria, these areas functioned as loosely connected zones rather than integrated provinces. Frontier regions, especially the steppe, highlands, and eastern corridors toward the Indus, remained fluid, inhabited by groups such as the Scythians, Dahae, and other mobile societies whose autonomy limited the reach of centralized control.