Externally Validated Prophecy

When a character makes a prediction about the future which is not fulfilled in the work, yet an audience aware of history knows will be fulfilled. A Call-Forward, but in real life.

Contrast It Will Never Catch On and This Is Going to Be Huge, where the character makes predictions that the audience knows will be invalidated.

Examples:

Film
  • In the 1983 French-Polish historical film Danton, the title character predicts before being guillotined that the Reign of Terror would collapse in three months. Technically, it took four, but close enough, right?

Literature
  • In one of Phillippa Gregory's novels, Elizabeth of York, wife of Henry Tudor (Henry VII) and mother of Henry VIII, gives birth to a girl, also named Elizabeth. In this series (and the TV version, The White Queen), Elizabeth of York and other women of her family have some kind of vaguely-explained magic or psychic ability. Elizabeth says "A girl named Elizabeth will be the greatest Tudor of them all." Her own daughter Elizabeth dies, but the prophecy did come true in the next generation.
  • Throughout his journeys in 1304's The Divine Comedy, Dante is warned about how the people of Florence will betray him; this takes advantage of the fact that the epic takes place in 1300, two years before Dante was exiled from Florence by his political enemies.

Music
  • "Cabinet Battle 3 (Demo)," as released on The Hamilton Mixtape, features a rant by Alexander Hamilton where he predicts slavery's population will increase the more and more legislators ignore the issue and that future generations will curse the names of the Founding Fathers for their negligence on the issue.

Mythology
  • The Aeneid by Vergil is an Ur-Example. Since it was sponsored by an emperor, many many asides tell of the glorious emperor/empire that is in the future of the main character's progeny. (The work also serves as a retroactive validation for the empire and dynasty at the same time.)

Theatre
  • In Macbeth by William Shakespeare, the prophecies about Banquo's progeny inheriting the throne in the future. At the time Banquo was believed to be an ancestor of the Stuarts, the family of James I (James VI of Scotland) who ruled at the time the play was first performed.
  • Hamilton's John Laurens, an avid abolitonist, wonders aloud whether the end of the Revolutionary war really means freedom. Rather tellingly, Commander-in-Chief and slaveholder George Washington tells him "Not yet," as it will take decades for slavery to be abolished in America.
    • The Cut Song "Cabinet Battle #3" takes this a step forward, when Jefferson and Washington concede that slavery is indeed bad, but banning it would never, ever get past the Southern states in Congress, and doing it by Executive Order would anger them beyond belief. They eventually hope that the next generation has a better solution - except they don't, and it's the main cause of the Civil War. See the above example under "Music".
    • And again in "Cabinet Battle #1": Hamilton mentions that if they get involved in the French Revolution, then they'll get involved in the revolution of every ally they have a defensive pact with, and asks where do they draw the line? Seems like rather potent commentary on present-day America's foreign policy.
    • The theme of the finale, "Who Lives, Who Dies, Who Tells Your Story" is that Hamilton got none of what the title wonders - he is one of two of the founding fathers to die before 80 (the other being Washington, who was very well known), and thanks to the other Federalists intentionally suppressing knowledge of Hamilton's works to disassociate themsevles from him, not many know the great things he did. His sister-in-law, Angelica Schuyler, notes in the song that "every other founding father's story gets told". Of course, because of the overwhelming success of the musical, Hamilton is now one of the most popular and well-known founding fathers, firmly entrenched alongside Washington, Jefferson, and Benjamin Franklin.
    • In "The World Was Wide Enough", Burr immediately and bitterly regrets shooting Hamilton, saying that "now he's the villain in your history". This is, of course, true - most people who know Aaron Burr know him as "that guy who shot Alexander Hamilton", not "former Vice President". Although later moving to the West and trying to secede from the US probably didn't help his case.
  • Doubling as a real-life example, the revolutionaries in Les MisÚrables believe that the people of Paris (and France as a whole) have to rise up against the new French king. They do, of course - in 1848, 16 years after the June Rebellion of 1832 (the failed rebellion depicted here).

Video Games
http://tvtropes.org/pmwiki/pmwiki.php/Main/ExternallyValidatedProphecy