Quis custodiet ipsos custodes? is a Latin phrase found in the work of the Roman poet Juvenal from his Satires (Satire VI, lines 347–348). It is literally translated as "Who will guard the guards themselves?", though it is also known by variant translations.
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The original context deals with the problem of ensuring marital fidelity, though it is now commonly used more generally to refer to the problem of controlling the actions of persons in positions of power, an issue discussed by Plato in the Republic. It is not clear whether the phrase was written by Juvenal, or whether the passage in which it appears was interpolated into his works.
Original context
The phrase, as it is normally quoted in Latin, comes from the Satires of Juvenal, the 1st/2nd century Roman satirist. Although in its modern usage the phrase has universal, timeless applications to concepts such as tyrannical governments, uncontrollably oppressive dictatorships, and police or judicial corruption and overreach, in context within Juvenal's poem it refers to the impossibility of enforcing moral behaviour on women when the enforcers (custodes) are corruptible (Satire 6.346–348):
Modern editors regard these three lines as an interpolation inserted into the text. In 1899 an undergraduate student at Oxford, E.O. Winstedt, discovered a manuscript (now known as O, for Oxoniensis) containing 34 lines which some believe to have been omitted from other texts of Juvenal's poem. The debate on this manuscript is ongoing, but even if the verses are not by Juvenal, it is likely that it preserves the original context of the phrase. If so, the original context is as follows (O 29–33):
Popular culture
The question "Who watches the Watchmen?" frequently appears in Alan Moore and Dave Gibbons' graphic novel Watchmen, but the phrase is seen in its entirety only on the closing page of Issue 11. Moore stated in an interview that the title of the series related directly to this question, although at the time of the interview Moore did not know where the sentence originated.
Robert A. Heinlein, a popular science fiction writer, chose the original Latin phrase as the motto of the Solar Patrol, as depicted in his 1948 novel Space Cadet.
The internet comedy group LoadingReadyRun made a video parodying the question of 'Who watches the Watchmen?', proposing that the Watchmen watch the city, the 'Neighbourhood Watchmen Watching Organisation' watch the Watchmen, the 'Watching The Neighbourhood Watchmen Watching Organisation Organisation' watch the Neighbourhood Watchmen Watching Organisation, and Geoff watches the 'Watching The Neighbourhood Watchmen Watching Organisation Organisation'. An unnamed person is seen to be watching Geoff.
An episode of Inspector Morse ("Absolute Conviction") references this quote. Whilst speaking with the prison governess Hilary Stephens in an Oxford college, Morse encounters his former college chaplain. Upon finding out that the head of a prison is off prison premises he asks "quis custodiet ipsos custodes?" Morse finds it amusing since the chaplain says this every time the two meet, only this time it is "remotely apposite".
An episode of the animated series The Simpsons refers to this philosophical question. In episode 1F09, "Homer the Vigilante", when Homer is talking about having abused his vigilante powers, his elder daughter Lisa asks, "If you're the police, who will police the police?" Homer responds, "I don't know. Coast Guard?"
It appears frequently in Terry Pratchett's Discworld novels, usually heard from Sir Samuel Vimes, Commander of the City Watch. He answers it in Thud!, though very briefly, with the line "I do." When asked who watches over him, he follows it up with "I do, too". It also appears in Feet of Clay and I Shall Wear Midnight. It first appears in Guards! Guards! from a citizen, also addressed to Vimes, as: "Quis custodiet custard?"
In the second Star Trek television series Star Trek: The Next Generation, episode #52 from season three is titled "Who Watches the Watchers". The episode involves a group of anthropologists who are observing a primitive culture, but are discovered after an accident causes their camouflaged "duck blind" to fail, revealing their presence.
During an episode of Justice League Unlimited, Batman says the phrase to Green Arrow after Arrow talked Superman and the other founding members out of disbanding the League. Green Arrow translates the Latin to "Who guards the guardians".
In Dan Brown's novel, Digital Fortress, the phrase appears engraved in a ring owned by Ensei Tankado, a former NSA employee who disapproved of NSA's intrusion of the people's private lives. The phrase is aimed at NSA who checks for any information on emails sent over the web that endangers national security. The phrase asks who will keep the NSA in check as they do others.
In Did I Ever Tell You How Lucky You Are? by Dr. Seuss, the entire town of Hawtch-Hawtch is employed as watchers watching over other watchers leading to the first watcher who is watching the "lazy town bee" so it will work harder. Since the bee wasn't working harder, it was assumed the bee-watcher wasn't watching hard enough and needed to be watched.
In the video game Halo: Combat Evolved Anniversary, the seventh Terminal's description is "Who monitors the Monitor?", and details 343 Guilty Spark's frustration with loneliness. The replacement of "watchmen" with "Monitor" is a reference to Guilty Spark's position of Monitor of Installation 04.
In Batman v Superman: Dawn of Justice, the phrase is hand written on a floor support near the staircase as Batman carries a weakened Superman over his shoulder at the climax of their duel.
In the Person of Interest television series, if The Machine ever suffered a hard reset it would then ring a public phone and ask the phrase, and whoever answered the call would have administrative access during 24 hours.