The Median Empire, was the first Iranian dynasty corresponding to the northeastern section of present-day Iran, Northern-Khvarvarana and Asuristan, and South and Eastern Anatolia. The inhabitants, who were known as Medes, and their neighbors, the Persians, spoke Median languages that were closely related to Aryan (Old Persian). Historians know very little about the Iranian culture under the Median dynasty, except that Zoroastrianism as well as a polytheistic religion was practiced, and a priestly caste called the Magi existed.