quo warranto 

mid-15c. (late 13c. in Anglo-French), "royal writ to determine by what warrant a person holds an office or franchise," a Medieval Latin legal phrase, literally "by what warrant," from quo "from, with, or by whom or what?," ablative of the interrogative pronoun quis "who?" (from PIE root *kwo-, stem of relative and interrogative pronouns). Also see warrant (n.).

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