The usurper has to have taken something from someone else, usually without the right to do so. The most common examples involve some type of royalty.
For Example:
"The usurper of the thrown was not nearly as kind towards his people as the man he dethroned."
(Classically - unrightful claimant to the throne)
"The king returned to his country to deal with the usurper."
"The usurper may have been the best choice to rule the empire."
(More modern examples)
"Lady Gaga is a declassé usurper of the place that should have been held by the late Leigh Bowery."
"Your sister could become the usurper of your position in your boyfriend's life."
Another
"The usurper murdered all of his rivals after he took the throne."
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