Suddenly-Suitable Suitor

""I just found out. That's what this says. I'm an honest-to-God prince! Will you marry me?""

- Lone Starr, Spaceballs

She loves him. He loves her. But they can never marry, because she's a princess, and he's not a suitable match for a princess.

Maybe they're hiding it from each other, because "I can't allow myself to love someone like him"/"A princess could never love a guy like me". Maybe she'd like to run off with him, but can't because her people need her. But their marriage is forbidden—not by her parents, but by law or the rules of society.

And then, his real parentage is discovered, and he's really a prince. Or maybe her royal father, realizing the law is unfair to his beloved daughter, repeals it.

If society would not accept it, the characters may resolve on defying it—and then get this as an added bonus.

Differs from Parental Marriage Veto in that it isn't the parents making the rules, and just sucking up to them won't fix it. Can lead to I Want My Beloved to Be Happy by one or both parties. If the Aesop has been divulged and is suddenly broken, it's a bad case of Sweet and Sour Grapes. Expect spoilers afoot!

Anime and Manga

 * Faked in Vampire Game. Yujinn manufactures a royal pedigree for Darres so he and Ishtar can get married.

Film

 * In King Ralph, a commoner likes Ralph for who, rather than what, he is, but even being seen with her is scandalous, since they can't marry until.
 * Island Princess Barbie film had this. She's actually the main character.
 * Spaceballs, as shown in the page quote.
 * In Disney's Aladdin, by law Princess Jasmine may marry only a prince. Once it's revealed that Aladdin isn't a prince, that rules him out...until the Sultan changes the law so that she can marry whomever she wishes. Ironically, Aladdin WAS a Prince of a sort already....
 * In Sleeping Beauty, Briar Rose is told she can't marry whom she wants because she is a princess and betrothed. But it is subverted in that Prince Phillip is told that he can't marry a peasant girl because he is a prince and betrothed—however, he seems completely willing to marry a peasant girl anyway, and his father seems to be at a loss to stop him. It turns out to be a Perfectly Arranged Marriage.
 * Disney's Cinderella was an aversion—it's never required that Cinderella be a princess or nobility, but rather that she be the same woman that the prince fell in love with. Every woman in the kingdom is tested, and Cinderella is discovered while she's still a servant to her family.
 * Subverted somewhat in that Cinderella's family was noble from the start, and as her father's only true heir, she's the only one legally entitled to inherit his entire estate—her step-mother just didn't want Cinderella to get everything while her own daughters only got dowries with a marriage.
 * In Thoroughly Modern Millie, it is revealed that
 * In Coming to America, Eddie Murphy plays an African prince who is arranged to marry a general's daughter, who has been groomed from childhood to be the "perfect wife" (i.e. a pliant, willing sexual partner with no independent thoughts or wants). He wishes for a woman who is more his intellectual equal and goes to New York to find one. He meets and falls in love with the daughter of a fast food restaurant owner and she falls for him as well, but the King (James Earl Jones) arrives and explains her the situation. She tells the prince they are from two different worlds and that she can not marry him, even though he offers to abdicate his throne and renounce all his titles. He finally leaves with his parents back to Africa and his mother berates the king for messing with true love, but the king replies that he can not violate tradition. She points out that he is the king and can do anything. The wedding day comes, and the prince meets his bride only to lift up the veil and see his love.

Literature

 * The Belgariad: Garion and Ce'Nedra (humorously inverted in that, once his parentage is known, it becomes an Arranged Marriage...and they've been thrown together all along with the intent that they fall in love).
 * Belisarius Series: Shakuntala and Raghunath Rao (partially subverted in that she needs to be pushed into the wedding, and then just ignores the rules).
 * Book of Swords: Mark and Kristen. Something of a subversion, in that it is suggested that the real reason the Tasavaltan nobility decides that Mark would be a suitable consort for Kristen is less that he is the bastard son of a mythical wandering clown, and more that they need a real warrior on the throne, and use that he is the son of the Emperor as a fig leaf.
 * This is a plot point in the first two books of Christopher Stasheff's A Wizard in Rhyme series. Complicated by the fact that the "divine right" to rule actually exists, as a talent for selecting the correct military/political decision for your country. But it has to be pointed out to the new queen that love and marriage are personal, even for royalty, and that in this case following her heart is not only good for her, but her country as well.
 * In the Sherlock Holmes story The Sign of the Four, Watson falls in love with Holmes' latest client, Mary Morstan. Then she inherits a treasure worth a large sum of money, and Watson feels it would be improper for him to make his feelings known. When the treasure is lost in the Thames and Watson confesses his feelings the two then got married.
 * In Walter Scott's Talisman, the protagonist, a seemingly normal poor knight who loved an English princess,.
 * In Reader and Raelynx, by Sharon Shinn, Cammon, a common man, and Amalie, the princess, fall in love. They then subvert this trope by.
 * Jane Eyre, though of respectable family, is penniless, friendless, and must work for her own living, and all these distance her irrevocably from her love, the gentleman Mr. Edward Rochester. He doesn't mind, and is happy to marry her anyway, but she herself cannot abide the thought of being utterly dependent on (and dolled up by) her husband. However, once  they are considered more equal, leading to that most famous and triumphant line, "Reader, I married him."
 * Well, not exactly. Jane finally gives in and agrees to marry Rochester when she realizes how in love they both are. Though she is still uncomfortable with all the finery, she makes a few deals with him about keeping her modesty and the plan the wedding. Things get called off though when
 * However, it's still strongly implied that she really was foolish to agree to marry him earlier, but has a much better shot at happiness with him once they are on more of an equal footing.
 * A variant occurs in one of Robert E. Howard's King Kull stories: the law forbids a certain young noble from marrying the girl he loves, because she's a slave. Even the King can't change the law, although he's thoroughly sympathetic to the lovers. And then the girl learns of a plot against Kull, and her lover rushes to the King's aid ... and Kull, at the end of the story, smashes the tablet on which that law is inscribed.
 * In Edgar Rice Burroughs's The Monster Men, Virginia is willing to love and marry Bulan even if he was a product of her father's experiments; Professor Maxon, while horrified by what he did while mad, concedes they may once he finds out that Bulan is actually a human with Easy Amnesia; but we still learn at the end that he's the son of a very wealthy American. (To be sure, neither he nor she dwell on that—they are chiefly glad that his amnesia did not hide that he was already married.)
 * In Gene Stratton Porter's Freckles, Angel would take him without such a background, but Freckles refuses. So she dug it up.

Live Action TV

 * Played with in Arrested Development. George Michael finds out that
 * The Big Bang Theory: When Leonard starts dating Leslie Winkle, suddenly Sheldon loses his opposition to Leonard/Penny.

Theatre

 * Zeroth Law of Trope Examples: In William Shakespeare's The Winter's Tale, the young prince falls in love with a shepherdess who is eventually revealed to be the believed-dead princess of the neighboring kingdom. The subtext there is that the prince could never have fallen in love with a real shepherdess, since she would've been vulgar and coarse; what he falls in love with are her inherent royal qualities shining through.
 * Even older than Shakespeare is the classical Sanskrit play The Recognition of Sakuntala, King Dushyanta laments that he cannot marry Sakuntala as he is a Kshatriya and she a Brahmin; however, he later rejoices on hearing that she was adopted by the sage Kanva and is really a Kshatriya too.
 * Gilbert and Sullivan used this device in H.M.S. Pinafore and The Gondoliers.
 * Also in The Pirates of Penzance. In the final scene,
 * In Oscar Wilde's play The Importance of Being Earnest, Jack can't marry the woman he loves because he's an orphan who as a baby was left in a handbag at a railway station. At the end of the play it turns out his parents actually were of good standing, and left him by accident, thus making it acceptable for him to marry a high society lady. Probably a parody of this trope considering the silliness involved. With a side of Values Dissonance: How do they know he's of appropriate social standing? He's the woman's cousin.
 * A slight variant occurs in Arsenic and Old Lace:
 * In Stuart Pattison's version of Cinderella, Cinders rejects Prince Charmless in favour of Callum the stable boy. Who then turns out to be Lost Orphaned Royalty of a neighbouring kingdom.
 * In Stuart Pattison's version of Cinderella, Cinders rejects Prince Charmless in favour of Callum the stable boy. Who then turns out to be Lost Orphaned Royalty of a neighbouring kingdom.

Video Games

 * Dragon Quest VIII: The princess who was a horse throughout the game has to marry Prince Charmless (literally) because of a political alliance between the two kingdoms. But wait! It appears the main character is Prince Charmless's cousin. What luck!
 * In a RuneScape quest, when Bob the Cat finds out he was once a human warrior, Neite agrees to elope with him.

Western Animation

 * Spoofed a bit in Codename: Kids Next Door. Numbah 3/Kooki and Mushi go on a Rainbow Monkey water ride with automatronic monkeys playing a kid-friendly version of Romeo and Juliet (no tragic deaths). The girl monkey is of royalty and can't marry the charming boy monkey, but he tells her a long family tree explanation that he's actually royalty. "That means..." A Rainbow Monkey wedding with its iconic theme tune!

Real Life

 * Gender-swapped: The Duke and Duchess of Windsor. She was an American divorcee. He was the King of England. (And, as such, head of the Church of England, and forbidden from marrying a divorcee.) Solved by having him abdicate the throne in favor of his younger brother George, father of the present sovereign, Queen Elizabeth.
 * His grand-nephew Prince Charles then ended up in a similar boat, in love with Lady Camilla Parker-Bowles. They both married others, then divorced, and (now that they have married each other) there is still debate about what will happen when Charles takes the throne; some have suggested he should remove himself from the succession over this.
 * Some historians suggest that the real reason that the government wasn't willing to change the rules and let King Edward marry Mrs. Simpson and retain the throne was her sympathy towards the then-current German Administration. Whether anyone in England in those days would have known enough to see this as a major liability is a potentially contentious issue.
 * Possible, but his chats to the German Ambassador about his chats with the Prime Minister and his very pro-German views were more concerning, which was why he was made a royal duke after his abdication, to politically neuter him.
 * Maybe everyone just decided at once that he was a Royal Brat and ought to be taken down a peg and told he can't have everything he wanted?
 * He already knew that. Because he was the heir to the throne, he wasn't allowed to go into battle with his platoon (or whatever). He did what he could to help, but he wasn't allowed to do the one thing he actually wanted to do.