Prolog Simon Boccanegra, a former pirate and victorious Admiral of the Genoese fleet, had seduced Maria, the daughter of the prestigious patrician Fiesco. From this connection, daughter was given an old woman in custody, draws up the girl on a deserted Beach in a squalid shack. Fiesco, who rejects the connection of Simon Boccanegra-Maria, has imprisoned the young mother who cons loves her seducer, in his palace. The leader of the people's Party, the populist Paolo, wants to expand its political influence: Simon Boccanegra, who can extricate his lover only from the hands of their father if he has enough power, you can persuade by Paolo, to run for the Office of Doge of Genoa. Paolo, which rises in turn to the confidant of Boccanegra, incites the crowd to vote for Boccanegra. But just before Simon is actually as the Doge, he meets Fiesco: this is only willing to excuse the seduction of his daughter, when Simon leaves him the child from this link. Since the child is nowhere to be found but disappeared for some time, this desire cannot be fulfilled. Fiesco refuses so the forgiveness. In addition, Simon must learn that Maria has died in their custody.
1 Act 20 Years later: The beautiful Amelia Grimaldi and the young patrician Gabriele Adorno are together in love. But Paolo also desires the young girl and especially the wealth of her family. Simon Boccanegra, which still is the Doge of Genoa, he required that he married them to each other. As Simon Paolo request submit to Amelia, she tells him the truth an orphan to be occurred after the death of the true Amelia Grimaldi in the place of the dead. To his great delight, Simon recognizes his daughter disappeared 20 years ago in the young woman. Because he recognizes their aversion to Paolo, Simon denied the marriage his minion. Now Paolo seeks revenge: he allows Amelia kidnap and bring into the House of the weak and spineless Lorenzino. But Amelia able to intimidate Lorenzino through threats and to be released from it. When Gabriele learns of the abduction, he penetrates to Lorenzino and stabs him. Because he believes see the mastermind behind of the kidnapping in Simon, he tries to kill him also in a Council meeting. But Amelia throwing herself between her father and her lover. Although it does not name the name of Paolo, but guesses Simon from her narrative, who was the handsome of this crime. Also the Doge is not called Paolo name, but he forces him to help him atone for the abduction: Paolo must curse the - not officially known criminal - public.
2 Act Paolo is planning to murder Simon Boccanegra. To make sure he selects two ways to execute his plan: he pours poison into the drinking vessel of the Doge and incites Gabriele Adorno to stab Simon Boccanegra (he he makes believe that Simon would be a lover of Amelia's) in his sleep. It includes Gabriele in the rooms of the Doge and moved away. Amelia occurs. It is provided by Gabriele to speech, would like to but the secret of their relationship to the Doge still not air. When the two hear the Doge himself nahenden, she hides her lover. In her conversation with her father, she calls the name of her lover: Gabriele Adorno. Although this preparing just an uprising against the Doge, Simon is ready to pardon him. Drinking from the poisoned cup he falls asleep. Amelia, who briefly leaves the room, enters at the moment, as Gabriele brings out with the dagger to stab Simon. Prevents the bloody deed and the awakening Doge tells the young man that he is the father of Amelia. Since you can hear the noise of the insurgents. Gabriele has now committed itself to Simon and is willing to fight with him.
3 Act The insurgents are defeated. Paolo, who had fought on the side of the rebels, has been recognized and is sentenced to death. On the way to the execution, he meets Fiesco and reveals to him the poison attack on the Doge. Then, Fiesco confronts the dying Doge. As Simon reminded him that Fiesco had promised to forgive him, if he'd given the granddaughter of Simon: now, he reveals the true identity of Amelia. Fiesco is broken and willing to enforce the will of the dying man: he announces the death of Boccanegra the moving crowd and declared the new Doge Gabriele Adorno.