''I vespri siciliani'' (The Sicilian Vespers, French ''Les vêpres siciliennes'') is an opera by Music/GiuseppeVerdi. The libretto, written by a popular French dramatist Eugène Scribe, and VeryLooselyBasedOnATrueStory, was originally in French but the opera has since become better known in its Italian translation.

It’s the island of Sicily, 1282 (or whatever year the production director decides it to be). The French have just conquered the island, killing its ruler Duke Frederick in the process, and have set their own governor, Guy de Montfort. The Sicilian LaResistance, led by [[TheSoprano Elena]], sister of the deceased Duke, and [[BassoProfondo Procida]], a Sicilian doctor, plans to assassinate Montfort and start a rebellion. The situation becomes much more complicated when one of the rebels, a [[TenorBoy young Henri/Arrigo]], turns out to be Montfort’s [[LukeIAmYourFather long-lost son]]…

Noted for its extremely difficult tenor part (with a high D, no less!), the opera is rarely performed today, although its grand overture and two arias (the soprano and the bass ones) are well known.

* AmbiguousEnding: It’s either this or a KillEmAll ending.
* AngryMobSong: The chorus in Act I and in the finale.
* AntiVillain: Arguably, Montfort. Really, he’s not as bad as LaResistance leaders would want us to believe.
* BadassBaritone: Procida is a bass and a morally ambiguous character, but quite badass for sure.
* BassoProfondo: Procida
* BreakTheCutie: Poor Arrigo. First he learns that his worst enemy [[LukeIAmYourFather is his father]], then the said father captures and threatens to kill Ariigo's girlfriend, then the girlfriend treats Arrigo like a piece of shit because she thinks he has betrayed their common cause... And finally, LaResistance members kill Arrigo's newfound father. Geez, does this guy need a break.
* BSODSong: what’s a Verdi opera without one? Arrigo’s ''Giorno di pianto''. Act 5 has a BSOD ''trio'' of Arrigo, Elena and Procida, all going BSOD for different reasons.
* TheChick: Elena
* LesCollaborateurs: First Procida and Elena accuse Arrigo of being one, then Procida accuses them both.
* CounterpointDuet: Arrigo and Montfort in Act I. The tenor is singing of how he hates the baritone, and the baritone admires his spirit.
* {{Determinator}}: Procida
* FaceHeelTurn: Though it depends on how you look at it, because of…
* GreyAndGreyMorality: Sure, Montfort and the French have killed the Duke and taken over the country, but the revolutionaries are [[TheRevolutionWillNotBeCivilized perfectly willing to instigate bloodshed and let young brides be raped]] if it serves their purposes.
* InformedAbility: the list of characters says that Procida is a doctor (the historical Giovanni da Procida [[TruthInTelevision was one]]), but it’s never mentioned in the opera itself.
* IrrelevantActOpener: Elena’s ''Mercé, dilette amiche'' in Act 5.
* LukeIAmYourFather
* MassiveMultiplayerEnsembleNumber: Act 3 grand finale.
* OminousLatinChanting: ''De profundis'' in Act 4
* LaResistance
* TenorBoy: Henri/Arrigo, of the most classic kind.
* TheUnfettered: Procida, who blatantly states he’d sacrifice ''anything'', even his honour, to liberate Sicily.
* UtopiaJustifiesTheMeans: Procida seems to believe it.
* VillainousLament: Montfort’s ''In braccio alle dovizie''.
* WellIntentionedExtremist: Procida
* [[YouKilledMyFather You Killed My Brother]]