Relator (law)

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Relator /rɪˈleɪtər/, female relatrix /rɪˈleɪtrɪks/, (Latin for "narrator") is the legal term meaning a private person at whose relation or on whose behalf an application for a quo warranto or mandamus is filed.^[1] The relator appears as one beneficially interested, but the action is maintained on his behalf. The relator furnishes the knowledge or facts on which an information or a proceeding in quo warranto is based. Such a proceeding is usually in the name of the state, ex rel. (ex relatione = "[arising] out of the narration") of the relator, and so is called an "ex rel. action".