The Egyptians are at war with the Ethiopians. Aida is an Ethiopian who has been captured and made slave to Amneris, the daughter of the King of Egypt. Aida is the daughter of Amonasro, the King of Ethiopia. The Egyptians are unaware of this. Amonasro plans to invade Egypt to free his daughter. In the meantime, Aida and Radames, a young Egyptian soldier, have fallen in love. The jealous and suspicious Amneris loves Radames, too. She senses that he loves another, but she does not know it is Aida. 