What is A government in witch the chief political leader is also head religious leader?

A government in which the chief political leader is also the head religious leader is known as a theocracy. In this system, political authority is derived from religious principles, and laws are often based on religious texts. The leader's authority is typically seen as divinely sanctioned, blending governance with religious leadership. Examples of theocracies include Iran, where the Supreme Leader holds both political and religious authority.