/ "Ah! Come to my arms..."). The gathered troops and the consuls of Milan all swear to defend the city against tyranny. Scene 2: Beside the ramparts of the city Rolando's wife Lida, who has lost her parents and brothers and who is downcast at the prospect of further war, also mourns the loss of her former love, Arrigo. She is unable to share in the general excitement of the upcoming battles. A German prisoner, Marcovaldo, who has been given some degree of freedom by Rolando, declares his love for Lida, but she is outraged and refuses him. As Rolando returns home, bringing with him Arrigo, Lida is angry (A frenarti o cor nel petto / "My heart, no longer have I the power..."). When Arrigo arrives, he is clearly upset to see Lida married to his best friend. But with Rolando suddenly called away to the Senate by the news that Barbarossa's troops are on the move, Arrigo and Lida are left alone. She tries to explain that her father encouraged her to marry Rolando after all believed that Arrigo had been killed in battle. But Arrigo will not listen and does not believe her. He declares her a "faithless one", and hurries away, wishing only to die in the forthcoming battle. Act 2 – "Barbarossa!" The town hall of Como The city fathers of Como have gathered to await the arrival of Rolando and Arrigo as ambassadors of the League from Milan. Como has been forced to come to terms with the invaders, and when the two men arrive, they announce that a new army has invaded from the north, that Barbarossa is having problems in Padua, and they seek Como's help, pointing out that the city lies between Milan and the invaders. They hope that Como will intervene to help the Italian cause. Suddenly, Barbarossa himself appears, proclaiming that "I am Italy's great destiny". His troops have surrounded Como and now further threaten Milan. He demands that Arrigo and Rolando return to Milan and seek its submission. Act 3 – "Infamy!" Scene 1: The Basilica of Sant' Ambrogio In the subterranean vaults of the Basilica, Arrigo is inducted into the Knights of Death, warriors who have pledged to fight to the death rather than suffer defeat or imprisonment. All unite to swear an oath to support the cause of Italy (Giuriam d'Italia por fine ai danni /