Libretto adapted from Antonio Salvi's Adelaide.
Scene:Italy, about 950. Before the action begins, Berengario had ruled Italy together with Adelaide's husband, but desiring all the power for himself, Berengario had Adelaide's husband poisoned and then tried to force her to marry his son Idelberto, who loves her. Adelaide refused, and now, as Queen of Italy, she has taken refuge in a fortress in Pavia.
Act 1 Berengario is full of ambition and rage and has sent his son Idalberto to storm the walls of Pavia. He receives news that the German King Lotario is on his way with an army to protect Adelaide. Matilde, Berengario's wife and fully his match in ambition and rage, announces that she has bribed Adelaide's soldiers to open the gates of Pavia to their forces. Her son is truly in love with Adelaide and begs his parents not to do anything that will endanger her, but Matilde will not be moved - Adelaide must marry Idelberto or face death.
In the castle at Pavia, Adelaide receives the German King Lotario, who has not only brought his army to her aid but loves her too. She accepts his aid and urges him to fight Berengario and Matilde. He will do so, he says, if she will repay him with her love (Aria:Rammentati, cor mio). Clorimondo, Berengario's general, appears to Adelaide and tells her she must either marry the son or be killed by the father (Aria:Se il mar promette calma) but Adelaide puts her trust in Lotario (Aria:Quel cor che mi donasti).
Berengario takes Pavia easily owing to the treachery of Adelaide's troops but she adamantly refuses to marry his son. Berengario goes to fight Lotario's army, leaving Adelaide with his wife Matilde, who loads her with chains and throws her in the dungeon.
Act 2 A contemporary caricature of Annibale Pio Fabri, who created the role of Berengario Berengario loses the battle against Lotario and is captured. He is a prisoner of war, and Lotario reflects that he is a prisoner to love.
In the dungeon, Adelaide is also a prisoner and does not realise that Lotario has defeated her enemy. Clorimondo enters with a crown in one hand and a vial of poison in the other - Adelaide can choose to be Idalberto's queen, or die. Adelaide, egged on by Matilde, chooses the poison and is about to swallow it when Idalberto bursts into the prison cell. He tries to rescue Adelaide but is prevented by his mother. When Adelaide is once again about to swallow the poison, Idalberto draws his dagger and threatens to kill himself, whereupon Matilde dashes the poisoned drink from Adelaide's hands. Matilde is not happy about this outcome however and warns her son to expect pain and Adelaide to look forward to punishment (Aria:Arma lo sguardo). Left alone together, Adelaide thanks Idalberto for saving her but says she can never love him. Idalberto accepts this and proclaims he will be content to admire her from a distance (Aria:Bella, non mi negar.) Adelaide is touched and grateful for his devotion (Aria: D'una torbida sorgente).
Act 3 Statues of Adelaide and her second spouse Otto I the Great (called Lotario in the opera) at the Meissen Cathedral In captivity, Berengario and Matilde appeal to Adelaide to stop the war by using her influence with Lotario to have them crowned king and queen of Italy. Adelaide refuses.
Berengario is beginning to regret his cruelty, but Matilde is made of sterner stuff. The two armies rush into battle, and Lotario seeing that Adelaide is in danger, calls a truce. Idalberto offers to die instead of Adelaide, however his father will not accept this, so the fighting starts again.
Clorimondo worries that he may have backed the losing side in this struggle and reflects on the transitory nature of human fortunes (Aria:Alza al ciel).
Idalberto discovers his mother arming herself for battle, ready to fight alongside her troops. He begs her not to, but she scornfully refuses to listen to her son express such cowardice. Clorimundo enters with the news that the battle is over and Lotario has won. The enraged Matilde accuses her son of causing this defeat and orders Adelaide brought to her so that she can kill her with her own hands but is told that Adelaide has already been released. Idalberto suggests to his mother that she kill him instead which strikes Matilde as a good idea, but she cannot quite bring herself to do it. The victorious Lotario enters and orders Matilde arrested whereupon she tries to commit suicide but is prevented.
Lotario lets Adelaide decide what is to become of Berengario and Matilde. Adelaide shows them forgiveness; they will be allowed to live in quiet retirement, while out of gratitude for saving her life, Idalberto will be King of Italy. Lotario and Adelaide will marry and rule Germany. They celebrate their love for one another (Duet: Sì, bel sembiante).
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