# Relator (law)

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**Relator** [/rɪˈleɪtər/](https://en.wikipedia.org/wiki/Help:IPA/English), female **relatrix** [/rɪˈleɪtrɪks/](https://en.wikipedia.org/wiki/Help:IPA/English), (Latin for "narrator") is the legal term meaning a private person at whose relation or on whose behalf an application for a [quo warranto](/source/Quo_warranto) or [mandamus](/source/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](/source/An_information) or a [proceeding in quo warranto](/source/Proceeding_in_quo_warranto) is based. Such a proceeding is usually in the name of the state, [ex rel](/source/Ex_rel). (*ex relatione* = "[arising] out of the narration") of the relator, and so is called an "[ex rel](/source/Ex_rel). action".

## Qui tam

A [qui tam](/source/Qui_tam) (in the name of the king) action may be brought by any party (as a relator) against an entity that is fraudulently collecting money from the United States government by filing false claims. The party bringing the suit – the relator – must have possession of information substantiating the claim of fraud against the government. The government shares a percentage of the monies collected, along with a share of treble damages and penalties if any, with the relator. The relator may be any entity including a private individual, trade association, or labor union. Congress authorized qui tam actions in the [False Claims Act](/source/False_Claims_Act).

## Pro Se

Qui Tam is related to [pro se](/source/Pro_se) (for self) and as such this should be considered in light of qui tam.

## References

1. **[^](#cite_ref-1)** A Dictionary of Modern Legal Usage. Copyright (c) 1990 Bryan A. Garner, [Oxford University Press](/source/Oxford_University_Press), Inc.

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