Historical Person Punchline

In a work set in the past, there's a twist at the end revealing that one of the supporting characters, whose identity has been hidden from the audience, is actually a famous historical figure.

Can overlap with Young Future Famous People and In the Past Everyone Will Be Famous. The Gump may be especially prone to having this kind of supporting character.

Not to be confused with You Will Be Beethoven, in which a time-travelling character becomes a famous historical figure.

Comic

 * The Life and Times of Scrooge McDuck is rife with famous historical persons, but their identities generally get revealed right away. There are exceptions though:
 * In The Buckaroo of the Badlands, Scrooge befriends a young man who chose to become a cowboy instead of continuing his political career. Scrooge inspires him to go back into politics. The story's last panel reveals this fellow's initials to be T. R..
 * In The Vigilante of Pizen Bluff, Scrooge meets a lot of legends of The Wild West: Buffalo Bill, Annie Oakley, P. T. Barnum, and the Daltons. And a Native American who escaped from his reservation and now performs in Buffalo Bill's Wild West Show. He is in the end revealed to be no other than . (He does mention his name well before the reveal though. But it is not the name he became famous with, and therefore a Genius Bonus. Scrooge, by the way, recognizes this name immediately.)
 * In the 1987 Mickey Mouse story Topolino e il ritorno al passato, Mickey and Goofy time travel to 16th century Saint-Rémy where they meet a young boy named Michel who accidentally follows them on their return to the present. Michel, who only speaks in rhyme, spends a day in the modern world. Before he is sent back to the past he secretly rips out random pages from history books and hides them in his pants, leaving Mickey and co. to wonder what he'd to with these fragments of knowledge. It turns out that Michel is.

Film

 * Shanghai Knights: The kid who's hanging around for most of the movie turns out to be Charlie Chaplin (and Artie turns out to be Arthur Conan Doyle, but that's not exactly hidden, given how many Sherlock Holmes references there are).
 * The boy in Shakespeare in Love who loves Titus Andronicus for its gruesome mutilations and vows that when he grows up he is going write plays full of murders and decapitations is John Webster, the writer of The White Devil and The Duchess Of Malfi.

Literature

 * In The Once and Future King King Arthur sends a young page, Tom of Newbold Revel, away from the coming final battle with Mordred, to preserve the memory of Camelot. Newbold Revel was the birthplace of Sir Thomas Malory. (Of course, this violates chronology wildly—but then, so does nearly everything else in the series.)
 * The first book of The Chronicles of the Imaginarium Geographica ends with the reveal that the three protagonists John, Charles and Jack are.
 * Stephen Fry wrote a Christmas Sherlock Holmes pastiche called The Adventure of the Laughing Jarvey. It features a decidedly un-festive Holmes and an author hoping to recover a stolen manuscript. By the end of the story.
 * In the novelization of Back to The Future Part III, the little boy who hands Marty his gun belt and calls him "Mister" was revealed by bystander conversation to be D.W. Griffith, future film pioneer.
 * In The Chinatown Death Cloud Peril, the protagonists (real-life pulp authors Lester Dent and Lafayette Ronald Hubbard) are joined by a young man who only identifies himself as Bob. He learns a lot about pulp writing and the growing science fiction scene from them, and at the end he reveals his last name: Heinlein.
 * The Grimnoir Chronicles: An accountant (who helped in the climactic battle, explaining that he fought with the Gordon Highlanders in World War One), turns out to be Raymond Chandler.
 * Crusade in Jeans by Thea Beckman: The student who is rescued by the protagonist and taught mathematics with Arabic numerals turns out to be Fibonacci.

Live-Action TV
"Sebastian: Good luck to you in your holy cause, Captain Sheridan. May your choices have better results than mine -- remembered not as a messenger. Remembered not as a reformer, not as a prophet, not as a hero, not even as Sebastian. Remembered only... as Jack."
 * In the Doctor Who serial Timelash, a young man named Herbert gets caught up in one of the Doctor's adventures, which involves a war between worlds, an invisible man, a time machine, and Morlox—and in the end, of course, we learn that he's Herbert George Wells.
 * Star Trek: The Next Generation, "Time's Arrow": Jack the bellboy turns out to be Jack London.
 * Interestingly, it's Mark Twain who tells him to go to Alaska, mostly to get rid of him.
 * New Amsterdam, "Soldier's Heart": Walt the orderly turns out to be Walt Whitman.
 * A few Quantum Leap episodes:
 * "How the Tess Was Won": The main plot of the episode is a Shaggy Dog Story. The real reason for the leap is that the guitar-playing kid whose name Sam doesn't know, and who he's been calling "buddy", turns out to be Buddy Holly, who needs a push on the lyrics to "Peggy Sue".
 * "The Boogieman": the kid to whom Sam keeps making Stephen King allusions (or, at least, to whom he presumably narrates these allusions after the All Just a Dream reveal) turns out to be "Stevie" King himself.
 * This also shows up as the punchline to a few brief jokes: Sam gives real estate advice to Donald Trump, shows dance moves to Michael Jackson, and performs the Heimlich Maneuver on the doctor it's named after.
 * In the Babylon 5 episode "Comes the Inquisitor", the Vorlons send a human named Sebastian to act as their Inquisitor. He acts, sounds, and dresses like a late 19th century upper-class Englishman, and claims he was taken by the Vorlons to do their bidding and is kept in suspended animation when he is not needed. He explains at the end that he thought he was chosen for a special destiny, but was wrong. And history was not kind:


 * In the short-lived show The Secret Adventures Of Jules Verne, the protagonists meet a young American boy named Al, deaf in one ear, who makes amazing inventions and is able to reverse-engineer a hovering machine from the future (or the past; not sure about this one). When leaving, he reveals that Al is a shortened form of his middle name - Alva. Yep, that's Thomas Alva Edison.
 * In Boardwalk Empire one of the main characters, Jimmy, meets a young up-and-coming bootlegger from Chicago. The two become acquaintances, have several conversations together, rub elbows committing crime, and after all of this, Jimmy finally asks his mysterious new friend his name. To which he casually reponds, "Al. Al Capone."

Western Animation

 * A time-travel episode of The Fairly Odd Parents had a little boy called Billy talking about computers and being called crazy. At one point, somebody goes "Oh, that Billy Gates!"
 * More "Person From Historical Fiction Punchline", but works in the same manner: In one episode of Back to The Future the animated series, the characters are in Ancient Rome and get some help from a slave named Judah who turns out to be a damn good charioteer. At the end he reveals his full name: Judah Ben-Hur.