Khvarenah, rendered in various transliterations including farr in later Persian, names a Zoroastrian concept of divine glory or fortune, a semi personified radiance that attaches to legitimate kings, priests and heroes, marking them as favored and rightfully empowered by Ahura Mazda and the wider Zoroastrian divine order.
The Avesta, Zoroastrianism's scripture, describes khvarenah as something that can be possessed, lost and fought over: the Yasht dedicated to khvarenah describes it fleeing from a legendary king, Yima, once he turns to falsehood, passing successively to other holders, a narrative that frames khvarenah not as an automatic property of royal office but as a conditional divine endorsement that depends on the ruler's continued righteousness and can withdraw if that righteousness fails.
The concept gave pre-Islamic Iranian kingship, particularly under the Achaemenid, Parthian and Sasanian dynasties, a religious vocabulary for royal legitimacy distinct from simple hereditary succession or military conquest, closely comparable in function, though not identical in content, to the Chinese Mandate of Heaven and to South and Southeast Asian devaraja and chakravartin ideologies of righteous, divinely sanctioned rule.