Zazu: As the king's brother, you should've been first in line!It's good to be the Prince. Born to power, destined to inherit rule of the Kingdom from your parents when their time comes. Bless their souls. Until you realize that kind of privilege only goes to the first son. If you're unlucky enough to be the second born, or if for you just hate the heir, you really gotta hope big brother doesn't have any kids or is unable to perform his duties. Or you could find a way to facilitate that. Central to the trope is that the younger siblings and their co-conspirators will plot, usually through dishonorable means, to overthrow, kill, or banish their older siblings in order to seize power for themselves. The siblings might make a Brains: Evil; Brawn: Good duo. Usually the first born son as the larger, stronger, heroic archetype. At worst he's a Jerk Jock but otherwise he's just a symbol of strength and is genuinely goodhearted. If that's the case then the younger prince is more wiry, smarter, and calculating. He can't beat his older brother in a straight duel, so he plots to have him shamed and banished, or outright killed. The older brother will typically never see the betrayal coming until it's too late. If the older prince lives, he'll likely start a war to dethrone his brother. If he dies, his child will grow into the cornerstone of a rebellion to overthrow the younger prince, who has turned himself into an Evil Overlord by this point. See Succession Crisis when the conflict becomes much larger than just the siblings' personal animosity towards each other. This trope should stay mostly in the family. Sub-Trope to Sibling Rivalry and Murder in the Family. Sister Trope to Cain and Abel. Annoyed at being Spare to the Throne, the younger brother usually becomes an Evil Prince, who then becomes an Evil Uncle to any of the first born's children. One of the few plot tropes where the younger sibling is the evil one in the family.
Scar: I was first in line. Until the little hairball was born.
Mufasa: That hairball is my son, and your future king.
Scar: I was first in line. Until the little hairball was born.
Mufasa: That hairball is my son, and your future king.
- Aquaman is the strong first born who, in most incarnations, is betrayed by his younger half brother Orm/Ocean Master. But this being a classic comic book character he escapes the peril and puts Orm behind aquatic bars.
- In the Justice League version, Orm chains Aquaman and his newborn son to the side of a cliff that's falling into magma. Aquaman gets one arm free and uses it to chop of his other hand so he can get out in time, and then goes to attack Orm directly.
- Hercules: The Disney adaption makes passing mention that Zeus and Hades are brothers. Zeus rules Olympus while Hades rules the underworld. The central conflict of the story involves Hades' scheme to supplant his brother Zeus, and become supreme ruler of Olympus, Tartarus and all the Earth in between. Zeus is of course the strongest god and older brothernote , while Hades is a schemer.
- The Lion King: Mufasa as the strong first born, and Scar as the smart, plotting second born who has been jealous of Mufasa for some time. He doesn't begin his betrayal in earnest until after Mufasa's son is born. Scar murders Mufasa and attempts to kill Simba, Mufasa's child son. Simba lives and leads a charge to defeat Scar in his adult years.
- Robin Hood, Prince John has his attendant Sir Hiss hypnotize his brother King Richard into embarking on a years-long crusade so that John can rule, at first ostensibly in Richard's name, but as time passes increasingly in his own.
- In the post-apocalyptic world in Ralph Bakshi's Wizards, the fairy queen Delia begat twins: Avatar the attractive wizard, and Blackwolf the repulsive wizard. Shortly after Delia's death, the two brothers fought. Blackwolf was defeated, and slunk away to the land called Scortch. There, Blackwolf developed a growing army of mutants and monsters, seeking to vanquish his brother Avatar, and attain mastery over all the Earth.
- Featured in the backstory of The Curse of the Mummy's Tomb; Re, younger of the Pharaoh's two sons, had his brother Ra banished and later assassinated out of jealousy. Ra ends up being the Mummy of the film, and Re is cursed with immortality, which can only be ended by his brother's hands.
- Thor is the strong first born, and Loki is the cunning second born in Thor. Loki tricks Thor into revealing how poor a choice of heir he makes, resulting in Thor's banishment. Thor eventually learns to be less of a Jerk Jock and resumes his place as heir.
- A chain of sorts in Sacha Guitry's Le diable boiteux. First the Comte d'Artois is shown checking up on his elder brother Louis XVIII very often, clearly expecting him to die soon. Then, when he ascends the throne as Charles X, his cousin Louis-Philippe does the same to him (though in Charles' case, he is dethroned before dying).
- The Iron Mask has Phillipe, the Evil Twin brother of King Louis XIV, hidden away in a countryside chateau. A jealous, bitter Phillipe eventually overthrows Louis, takes his place, and has Louis chucked into a dungeon where he has to wear an iron mask. This is a change to the Dumas novel—see Literature below—where King Louis is the mean one and Phillipe is the one wearing an iron mask in a dungeon.
- The King's Speech: Prince Albert's brother (the crown prince) mocks him by misinterpreting his words as intending to replace him on the throne, calling it "positively medieval".
- Blackadder: In "Born to be King" Blackadder buys into a rumor that his mother had an affair and his older brother Harry is actually a bastard, and thus Blackadder is the rightful heir to the throne. But when the details surface it looks like the affair might have produced Blackadder himself, so he immediately has the messenger killed.
- One Midsomer Murders episode has the younger brother of an aristocrat try to murder him via Sword Fight, less for the title and inheritance than his mistress (the brother's wife). All for Nothing anyway, since the wife cheerfully informed her now ex-lover that she was part of the aristocracy now, and not about to waste her time with him. Note that the husband had already committed several murders by this point, one of them an Ignored Enamored Underling reporting the wife infidelity on the wedding day, in the name of preserving the family reputation.
- In A Brother's Price, the royal family started a war about which princess should be considered Eldest. Particularly pointless, as sisters usually rule jointly, the Eldest merely has more influence. The protagonists avert it, Princess Ren doesn't really want the responsibility, which was forced onto her by the death of her elder sisters. The next in line, Halley, went undercover and vanished from the palace, in an attempt to force people to look up to Ren more, as they usually asked Halley about everything important, first.
- In Dragon Bones, High King Jakoven was first in line. He still had his younger brother locked up in an insane asylum, just to be on the safe side. The protagonist, Ward, is first in line to become the lord of castle Hurog, but has been declared insane and unfit to rule by Jakoven. His younger brother Tosten suspects that Ward intends to murder him to get rid of the competition, but in a subversion, Ward has no intention at all of doing so, having been the one who saved Tosten's life after a suicide attempt.
- The Chronicles of Amber are pretty much all about this. The main character of the original pentalogy is an heir to the Amberite throne and keeps fighting his brothers over it for much of the novels. In the second pentalogy, the new protagonist is no longer a direct contender but power plays around the throne still complicate his life a lot.
- Although cousins rather than siblings, King Verence and Duke Felmet from Wyrd Sisters are like this. Verence is the large and heroic king, who gets murdered by his plotting cousin Felmet. Tomjon, Verence's son, raised by a theatre group, is expected to return and overthrow his uncle. Things didn't quite turn out that way, but the kingdom of Lancre did get a rightful king. Probably.
- Ghosts in the Yew by Blake Hausladen has this as a major subplot. Prince Barok and Prince Yarik of the Zoviyan Empire scheme against each other mostly for lack of anything better to do (they have numerous older brothers at the book's start.) Prince Barok loses one of their skirmishes and is exiled to the remote province of Enhedu. This turns into Reassignment Backfire when Barok undergoes a forced Heel–Face Turn in relative safety while his brothers slaughter each other.
- Alexandre Dumas pere wrote The Man in the Iron Mask as the third work in his King's Musketeers series. This is the story of the horribly vain and corrupt Louis XIV keeping his younger brother Philippe prisoner on the Isle de Sainte Marguerite. An iron mask was used so that no one could see that Louis and Philippe were identical twins. The Musketeers are charged with freeing Philippe and supplanting Louis with him.
- In Patience Princess Catherine of the Young Royals series Henry is the younger, athletic brother but Arthur is next in line to be king. Henry knows that he would make a better king than Arthur.
- In The Prize of the Game by Jo Walton, the three cousins Conal, Darag, and Leary are all heirs to the throne of Oriel (they are all nephews of king Conary), and have also been raised together. Conal and Darag have a fierce rivalry, that escalates to the point where the three are sent away to the neighbouring kingdoms for a series of tests to determine who shall be the next king.
- In A Song of Ice and Fire both of King Robert's younger brothers, Stannis and Renly, make claims to the throne after Robert's death. Inverted in terms of archetypes as Stannis is the older one and thus the rightful heir but is very unpopular, while Renly is very charismatic and rallies many more houses to his cause. Stannis gives his younger brother the chance to declare fealty to him, and assassinates him when he refuses.
- In Neil Gaiman's Stardust, there are seven princes of Stormhold, all of whom are attempting to bump each other off in order to inherit their father's throne. At the beginning of the story, four are dead already.
- Subverted in The Horse and His Boy. At the end Shasta just discovers he is really Prince Cor of Archenland and will inherit the throne, being 20 minutes older than his twin Corin. Cor apologizes to him for unexpectedly taking the throne from him, but instead Corin cheers because he didn't want to be king; as a prince he won't have to worry about responsibility and will get to keep having fun.
- Everywhere in Tales of the Branion Realm: sometimes played straight, as when an Evil Uncle murders the sovereign and tries to seize the regency of the heir, but also averted by the jealous younger sister of another heir, who remains loyal to him after he takes the throne.
- Jacob and Esau in The Bible fit this trope in everything but the "prince" part. Esau, the elder (and also the brawnier, manlier one), stands to inherit his father's lands, but Jacob, the younger (and also the more domestic one) plots with his mother to disinherit him. Jacob also becomes the one to fulfill God's promise of founding a great nation (the Israelites), though that seems to be more by divine grace than through his own scheming.
- Hamlet. King Hamlet was the first born who was a warrior king with some implication in the text that he wasn't the most likable guy; Claudius, the second born, is the smart and charming plotter. Claudius murders King Hamlet and Prince Hamlet ends up trying to avenge his father's murder.
- Also King Lear: The younger and bastard son Edmund seeks to supplant his brother Edgar.
- In The Lion in Winter Henry's three sons, John, Geoffrey and Richard, all aspire to be king. Queen Eleanor favors their oldest surviving son Prince Richard while King Henry wants John to be the one to inherit his throne.
- Fire Emblem Elibe. In Fire Emblem: Blazing Sword, Hausen as the strong first born, and Lundgren as the smart, plotting second born. Lundgren thought he would just wait it out until Hausen died naturally after Hausen's only daughter eloped. But when word spread that Hausen's long lost granddaughter Lyn was coming to claim her rightful throne, Lundgren started poisoning Hausen to speed up the process before she arrived. Totally backfires when Lyn kills Lundgren and Hausen makes a full recovery from the poisoning.
- In Warhammer The backstory of Vilitch the Curseling has this. Vilitch was the younger son of a tribal chieftain, his older brother Thomin getting all the love and caring while he was bullied by everyone in the tribe for being infirm. Tzeentch heard his prayers, and fused the brothers' bodies together: Vilitch casts spells, his body fused to Thomin's shoulder while his brain-dead brother keeps attackers at bay with his swordsmanship.
- In Dragon Age: Origins, King Endrin's middle child murdered Trian, his elder brother, and was exiled; Bhelen, the third and youngest child is suspected of having a hand in the murder, which causes a Succession Crisis when Endrin allegedly has second thoughts before dying about putting Bhelen on the throne. (The events are seen in more detail in the Dwarf Noble origin, with the Player Character being the middle child; Bhelen does try to manipulate the PC into killing Trian. Regardless of whether the PC goes along with it, Trian ends up dead, and the PC takes the fall and is exiled.)
- When a king passes on in the Crusader Kings games, the new king's brothers usually inherit some sort of claim of their own on the throne, guaranteeing there will be strife if the eldest isn't really cut out for the job. Even princes who are fairly far down in the line of succession may petition their ruler to grant them holdings of their own from time to time, so that they'll at least get something to leave to their own children.
- Of course, that's with the Primogeniture method of succession, which is generally considered one of the best means but many Western European monarchs start out with Gavelkind, where holdings are divided up among all sons. Naturally, sons who may lose their inheritance are likely to rebel if father tries to switch succession methods.
- Avatar: The Last Airbender:
- Iroh is the larger good hearted rightful heir and Ozai is the plotting evil younger brother who tries to use Iroh's moment of weakness (his only son dying) to persuade their father to pass over him for succession. Some shady business later, their father dies, and his dying wish is exactly what Ozai asked for. Unusually, although Ozai is an evil schemer and has a smaller frame, there's no indication that Iroh is any stronger (the usual dynamic for this trope). They're both firebending prodigies; the outcome of a duel between them would be uncertain, and Iroh is even more uncertain about the prospect by the time of the show, when Iroh has become old and Ozai is in his prime.
- While she is smaller, and a schemer, and evil, Azula is also stronger than her older brother Zuko who should be Overlord Jr., but is instead a Token Good Teammate to his evil family and rightful heir. Azula never really indicates that she has designs on the throne for herself until Zuko does a Heel–Face Turn and leaves the family and its about to be handed to her, but she always made sure that if anything went wrong in the family Zuko would get the blame from the beginning.
- Tonraq as the strong first born, and Unalaq as the smart plotting second born in Legend Of Korra. Unalaq tricks Tonraq into getting himself banished. After experimenting in the Spirit World, Unalaq becomes stronger than Tonraq too and actually engages and defeats him in a proper duel.
- Subverted in ThunderCats (2011). The King's adopted son (Tygra) and blood son (Lion-O) often fight, usually because Tygra has proclaimed (yet again) that he'd be a better king than Lion-O...but, despite being visibly tempted by the idea, Tygra never betrays him. Because of Outside-Context Problem Mumm-Ra killing and usurping their father early in the series, their rivalry is, actually, only relevant for a handful of episodes.