No, not really. It's just that she's not allowed not to marry. She may have held out as long as she could and just been forced—or at least coerced—into marriage.
They may have told her "You Have Waited Long Enough"—if, indeed, they were even aware that she had promised to wait.
Good thing that you can show up in time for the wedding, isn't it? This can be the wedding itself, or even the wedding feast, for maximum drama, as long as it is in time to stop the marriage being consummated. Other works may have the true love arrive with as much as several days to spare.
Common in situations where Arranged Marriage is the practice. Though wills with deadlines to marry may also come into play, and family situations where pressure to marry is expected. (If the characters are sympathetic, they may believe the love to be dead, or be unaware of the relationship.) Royalty may face considerable pressure from courtiers and others who expect an heir to the throne; a prince or princess may face double pressure from their parents.
The heroine may sacrifice herself because her heart is broken, believing the true love to be dead; in that case, the match can be made very quickly after the reported death.
- Child Ballad Hind Horn
''The bridegroom he had wedded the bride,But young Hind Horn he took her to bed.''
- Child Ballad Young Beichan
Tak hame, tak hame your daughter dear,
A blessing gae her wi,
For I maun marry my Burd Isbel,
That's come oer the sea to me.
There is a wedding in yonder hall,
- In some variants, on arrival, the heroine finds that the wedding festivities have gone on for thirty days without the hero having consummated the union.
Has lasted these thirty days and three;
Young Beichan will not bed with his bride,
For love of one that's yond the sea.
- In some non-English variants, the hero has been magically forced to forget her.
- In "The True Sweetheart", the heroine dresses up for the ball in order to win back the prince, who had been enchanted into forgetting her.
- In "The Two Brothers", collected by The Brothers Grimm, and "The Three Princes and their Beasts", collected by Andrew Lang, the false hero forces the princess to claim that he saved her, and claims the Standard Hero Reward, but the hero arrives at the wedding and saves her.
- In "The Three Princesses of Whiteland", the hero violated a prohibition, and only makes his way back to the heroine in time to stop her wedding.
- In "East of the Sun and West of the Moon", the heroine's quest to find her husband succeeds because he is able to hold off the troll he is to marry by demanding she wash an enchanted shirt; only the heroine can wash it and claim him.
- In some versions, the shirt isn't enchanted; the troll bride(s) just literally can't wash things and have them end up cleaner than they started out. The 'dirt' has also been blessed candlewax, which the troll(s) can't remove.
- In "Tsarevitch Ivan, the Fire Bird and the Gray Wolf", after the older brothers have murdered Prince Ivan, he nevertheless arrives in time to stop Helena the Beautiful's forced marriage to his brother Vasilii.
- In "Bearskin" the young soldier frees a man from debtors prison, and the man promises the hand of one of his three daughters in gratitude. The two eldest refuse him, disgusted by his appearance, but the third agrees, believing him to be a good man. He promises to return in three years to the day to marry her, or else he will be dead and she will be free to marry whomever she pleases. However, he returns a day late having taken the time to dress himself as a rich and important man, and the family does not recognize him. He again offers to marry one of the mans daughters, the two eldest volunteer, but the youngest refuses, as she has gone into mourning.
- In "Daughter of the Skies", the heroine finishes her quest and arrives during the wedding preparations and bribes the false bride into letting her at her husband; the false bride drugs him twice, but the third time, he is alerted to what she had done the first two, and doesn't drink the drug.
- Also in "The Sprig of Rosemary".
- In "The Hoodie-Crow", the heroine finishes her quest, finding the place, and is hired by the cook. She prepares the wedding feast and slips her ring into it; the prince recognizes it and says he must marry her.
- In "The White Wolf", the heroine makes it to the castle where the wedding, bribes her way to his room, and pours out her story. The next day, at the wedding feast, the hero marries off his new bride to someone else and keeps the heroine
Then, when all the guests were assembled in the banqueting hall, he spoke to them and said: "Hearken to me, ye kings and princes, for I have something to tell you. I had lost the key of my treasure casket, so I ordered a new one to be made; but I have since found the old one. Now, which of these keys is the better?"
Then all the kings and royal guests answered:
"Certainly the old key is better than the new one."
"Then," said the wolf, "if that is so, my former bride is better than my new one."
- Played with in "The Enchanted Snake", where the hero refuses to marry the woman who healed him because he is already pledged to another. Fortunately, they are the same woman.
- In The Feather of Finist the Falcon, the heroine arrives to find Finist marrying the Tsar's daughter. She bribes her way to him three times, but the Tsar's daughter has put an enchanted pin in his hair to keep him asleep; the third time, she touched him and knocked the pin out.
Then he summoned all his princes and nobles and his officers of all ranks and told them the story, asking: "Which of these two am I to wed? With which can I spend a long life so happily that it will seem a short one: with her who would deceitfully sell my hours for playthings, or with her who sought me over three times nine lands? Do ye now discuss and decide."
And all cried with one voice: "Thou shouldst leave the seller of thy rest and wed her who did follow thee!"
- In "The Blue Mountains", the hero arrives on the wedding day of the heroine and bribes a servant to bring her to him. As soon as she recognizes him, they marry instead of her new bridegroom.
- In "Maid Maleen", Maleen arrives as the prince is marrying his new bride; her father had locked her in a tower for seven years.
- In Road Trip, E.L does this on Josh directing him to Beth.
- Buttercup in The Princess Bride is forced to marry Humperdinck when she thinks Westley is dead. Fortunately, he shows up to rescue her. Twice.
- In Crouching Tiger, Hidden Dragon, Shu Lien had refused to get into a relationship with Mu Bai, because her fiancé (and also Mu Bai's best friend) had died in battle. Mu Bai also refused to get in a relationship with her, to honour his best friend's memory since he felt guilty for not having been able to help him. However, everyone else, including Jen, had invoked this trope to try to get them together. It's a massive Tear Jerker when they finally acknowledge their feelings... when Mu Bai is dying after being poisoned. They can only share a Last Kiss before he goes. And to make matters worst, in the sequel we learn that Shu Lien's fiancee himself faked his death because he believed Mu Bai and her were a better match.
- In Cast Away, Chuck makes it through his ordeal by believing that his fiancée is waiting for him back home. Hearbreakingly, she had waited for years after everyone else had given up on him. He's still too late though, as it has still been several years since she gave into the pleas of her family and moved on. Her new life includes a loving husband and daughter.
- In "The Adventure of the Noble Bachelor" Sherlock Holmes is called in when a bride disappears within hours after the wedding ceremony. He deduces the existence of the true love, tracks down the couple — who had actually been married before, but she believed him dead — and persuades them to come clean to the rejected bridegroom.
- In Edgar Rice Burroughs's A Princess Of Mars, Dejah Thoris agrees to marry another prince, believing John Carter to be dead. He appears and leads an attack on the city to free her — carefully assuring that someone else kills the prince, since she would be forbidden to marry the man who killed her fiance.
- In the Chivalric Romance King Horn, when Horn left his childhood sweetheart, she gave him a magical ring that let him know that he had not lost her. When it changed color, he hurried back and found her being forced to marry.
- In "The Sworn Sword" by George R.R. Martin, Lady Rohanne (a.k.a. the Red Widow) will lose her lands if she doesn't remarry by deadline.
- In Star Trek: The Original Series, McCoy promised to meet up with Natira, his wife from the generation ship Yonada, when it reached its destination; chronologically, it should've done this shortly after the end of the series. He clearly didn't stay with her from the films, and most Expanded Universe novels say that as High Priestess she was obligated to marry someone else, either before planetfall or because he didn't return.
- Inverted in Harry Potter. Harry believes that he will spend the rest of his life fighting Voldemort and Ginny will end up marrying someone else, and he's cool with that. In the end, he defeats Voldemort and he and Ginny wind up married.
- The Icelandic Sagas: Laxdæla Saga and Gunnlaugs Saga Ormstungu both provide examples of this. There may be even more examples. But in both these examples the Hero does NOT get back in time and the love of his life goes to another man; with predictable results, we are talking Vikings after all...
- The Odyssey has Penelope being pressured to remarry because her husband is taking too long to come back from his sea voyage. She claims that she'll marry once she finishes weaving a burial shroud for Odysseus' father, meanwhile secretly unraveling the work at night. When her deception is discovered, she says she'll marry the guy who can shoot her husband's bow, that only her husband is strong enough to pull back. Of course, Odysseus arrives in time for the ensuing contest (and righteous slaughter of the pretenders).
- The Count of Monte Cristo Mercedes does spend some time waiting for Edmond after he is forcibly imprisoned but she does eventually decide to marry Fernand (his betrayer, unbeknownst to her). When Edmond eventually escapes and makes his fortunate he's very unforgiving of her but eventually concedes that she had little other choice. By that time however she has changed her mind on the matter.
- In BBC's Robin Hood, Marian has put off getting married for an inordinately long period of time, to the point where the Sheriff can make snarky comments about her being "still a maid" at the grand old age of twenty-one. Robin notes her unmarried status with interest when he returns back from five years fighting in the Holy Land, and even Guy of Gisborne (who coerces a promise of marriage from her) isn't immune to the fact that her singleness is due to the fact that "[she was] once betrothed to Robin Hood".
- In Legend of the Seeker, there is an alternate future episode in which Kahlan marries Darken Rahl because Richard is trapped fifty-eight years in the future, with no other way to return.
- In the book, she was about to take a man as her mate, because Richard wasn't supposed to return home for about three centuries, and the magic of the Confessors had to live on. Right before she does, she learns Richard is back.
- In The Winter's Tale, the king's courtiers attempt to invoke this in the final acts: because he has no heir and is a widower, it is his duty to remarry. Leontes objects, however, that the oracle foretold that he would live without a heir unless his lost child was found, and so remarriage would not succeed. He is heartily supported by Paulina, who knows his wife is still alive.
- This is the reason Sara married the Duke of Nottingham in Donizetti's Roberto Devereaux. She was still in love with the title character, but the queen - who also loved Roberto - pressured her to marry.
- In Final Fantasy VI, the opera that Celes is forced to take part in is about a Princess, Maria, forced to marry the prince of the conquerors of her homeland, for her people's good even though she still pines for her lover, the Knight Draco, who is presumed dead. During a ball, Draco turns up, duels the suitor (who dies claiming he did truly love Maria as well) and then the lovers are reunited. Then the prince and knight are knocked out by the adventurous treasure hunter and the octopus king, who proceed to also duel for princess Maria's hand. And then the princess gets kidnapped by a sky pirate.
- In one of the endings for Romancing SaGa: Minstrel Song, Farah's mother attempts to convince her to move on with her life rather than keep waiting for her missing Love Interest, and tries to hook her up with another guy. Farah refuses, and the very last scene implies Jamil survived the final battle after all and will come back for her.
- In the Gargoyles episode "M.I.A.", Griff, a British gargoyle believed killed in the London Blitz, is rescued by Goliath and travels 50 years into the future. (Destiny, Phoenix Gate, long story...) It was strongly hinted that he and Una were in love in the 40s, but by the 1990s, she had taken Leo as her mate (and they appear to be the only two gargoyles left in the city). Griff seems to take it all in stride, but it would explain why he wasn't in any hurry to return to London after his adventure with King Arthur.
- Some time after J.R.R. Tolkien met his future wife Edith, his guardian forbade them from seeing each other until Tolkien turned 21. After turning 21, he went back to her, only to find out she was engaged. Shortly thereafter, Edith broke her engagement to marry Tolkien. (See also: Beren and Luthien. Based on a True Story indeed...)
- This happens often in some more conservative cultures in the process of modernizing. For instance, in much of the Middle East, there is great pressure for women to marry before they turn 30 (same principle that informs the Japanese). Many women do find men they would like very much to marry and are personally and socially acceptable to their family...but because, in many of these countries, the economy/job market chronically sucks, he can't find proper work and is thus economically unacceptable (he couldn't support her). So it often happens that women wait for him to get a (better) job...and wait...and wait...and at a certain point the parents (or grandparents) get frustrated and tell her to marry someone else.