Tianming, the Mandate of Heaven, is the doctrine that the right to rule is conferred by Heaven on a virtuous ruler and withdrawn when the ruler becomes unworthy. It appears in early Zhou texts, the Book of Documents and the Book of Odes, and it was articulated in the first instance to justify the Zhou conquest of the Shang around 1046 BCE: the Shang had held the mandate and forfeited it by misrule, and the Zhou had received it.
The doctrine has features that distinguish it from most theories of divine right. The mandate is conditional rather than permanent, and is held on performance. It is not tied to a bloodline, so that in principle a commoner may receive it, and Chinese history supplied the cases, in the peasant founders of both the Han and the Ming. Its withdrawal is signalled by observable events: floods, drought, famine, earthquakes, unusual celestial phenomena and popular rebellion were all read as evidence that Heaven's favour had passed, and the historiographical convention of the dynastic cycle was built directly on that reading.
Its most consequential elaboration is Mencius'. He drew the conclusion that a ruler who has lost the mandate has thereby ceased to be a ruler: asked about the killing of the last Shang king, he replied that he had heard of the punishment of a mere fellow, not of the murder of a sovereign. And he made the people's acceptance the practical evidence of Heaven's, quoting the Documents to the effect that Heaven sees as the people see and hears as the people hear. This gave Chinese political thought a doctrine of justified removal, and it was uncomfortable enough that the founding Ming emperor is reported to have ordered passages of Mencius struck from the examination curriculum.
The doctrine is contested in its interpretation. One reading treats it as a genuine constraint on rulers and an early theory of accountability. Another treats it as retrospective legitimation, invoked by whoever won, and therefore incapable of restraining anyone in advance, since the evidence that a ruler has lost the mandate is that he lost. Both observations are accurate, and historians generally conclude that it operated in both ways at different times, functioning as a real rhetorical and moral constraint on rulers who cared about it and as a serviceable justification for those who did not. It retains rhetorical force in contemporary Chinese political discourse, where commentators inside and outside the country still reach for it when discussing legitimacy, disaster response and popular consent.