Aida
Radames and the Egyptian army march into the city to celebrate their victory.  The Ethiopians who have been captured are brought before the crowd.  One of them is the Ethiopian king, Amonasro, father of Aida, although the Egyptians do not know who he is.  Aida rushes to her father.  She explains to the crowd that Amonasro is her father.  Amonasro tells the Egyptians a lie: he says that the Ethiopian king (he himself, of course) has been killed in  battle. Aida, Amonasro and the captured Ethiopians all plead with the Egyptian King to save them, but the Egyptians want them to be put to death.  Radames pleads with the king to spare Aida and Amonasro.  The King rewards Radames by saying he can be King of Egypt and that he can marry his daughter, Amneris.