Arianna in Creta, HWV.32

The Athenians embark in Crete, alongside a stone tablet with the terms of the Athenian tribute inscribed on it. King Minos agrees to Teseo's request that Arianna be freed. Among the Athenian maidens sent to be sacrificed is Carilda, whose beauty is noticed by the Cretan champion Tauride; he instantly falls in love with her. Carilda is however secretly in love with Teseo and is interested in neither Tauride or the Athenian youth Alceste, who is also in love with Carilda. Teseo tells his beloved Arianna that he is determined to slay the Minotaur, making her fear for his safety, and also tells Alceste, who wants to rescue Carilda from a cruel death, that he is more fitted for the task.
In the temple of Jupiter, King Minos orders Alceste to draw the name of the first victim from an urn. Alceste is distressed when the name he draws from the vessel is that of his beloved Carilda. Teseo offers to go into the labyrinth to meet the Minotaur in her place, which Minos accepts, but makes Arianna jealous, believing Teseo must be doing this out of love for Carilda.

In a wood, Teseo ponders whether he should continue with his plan to try to kill the Minotaur, or refrain out of consideration to his beloved Arianna. He falls asleep, and has a vision of his destiny as the liberator of his people from cruel suffering. When he awakes, all indecision has been removed from his mind – he is determined to kill the monster. Alceste, like Arianna, is concerned that Teseo is acting out of love for Carilda, but Teseo assures him that he will never love anyone but Arianna and reveals to Alceste that Arianna is really the daughter of King Minos, but neither she nor the King knows it.
Arianna overhears a conversation between Minos and the Cretan champion Tauride – to succeed, Teseo will have to slit the Minotaur's throat, find his way out of the labyrinth by using a ball of string to mark the way, and subdue Tauride in spite of his magic belt which gives him superhuman strength. Though still distressed by the thought that Teseo is attempting this to rescue Carilda whom he loves, Arianna passes this information on to Teseo.
Further misunderstandings reinforce Arianna in the mistaken belief that Teseo is in love with Carilda, and she accuses him of faithlessness.
At the entrance to the labyrinth, Carilda is about to be sent down to be devoured by the Minotaur, when Tauride appears and begs her to run away with him. She refuses. Alceste also appears however, kills the two guards and takes Carilda away. Minos is furious that she has escaped and blames Teseo for this. He orders Arianna to take Carilda's place as the first sacrifice to the monster. Arianna laments her fate.

Teseo descends into the labyrinth, marking his way by using a ball of string, and slays the Minotaur by stabbing it through the throat. He rescues Arianna and swears to her that he loves her.
Outside the palace, Teseo and Tauride are to meet in single combat. Teseo's first action is to tear Tauride's magic belt from his waist, after which Teseo easily vanquishes him.
King Minos announces that Teseo has fulfilled the conditions for ending the Athenian tribute. Teseo asks permission to marry Arianna, and Minos agrees on condition that her father gives his consent. Teseo reveals that Minos himself is Arianna's father, whereupon Minos happily gives the couple his blessing. Arianna and Teseo joyfully celebrate their love.
Inside the palace, a double betrothal is announced – the hero Teseo will marry his Arianna and Alceste has now been accepted by Carilda. All celebrate the fortunate turn of events.