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A dynasty is a sequence of rulers from the same family, usually in the context of a feudal or monarchical system, but sometimes also appearing in republics. Alternative terms for "dynasty" may include "house", "family" and "clan", among others. The longest surviving dynasty in the world is the Imperial House of Japan, otherwise known as the Yamato dynasty, whose reign is traditionally dated to 660 BCE and historically attested from 781 CE.
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