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"Usurp" redirects here. For the use within Wikipedia, see Wikipedia:Changing username/Usurpations.

A usurper is an illegitimate or controversial claimant to power, often but not always in a monarchy. This may include a person who succeeds in establishing himself as a monarch without inheriting the throne or any other person exercising authority unconstitutionally. It may also be applied to an official acting ultra vires, outside his authority or jurisdiction.

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