Aida
When Radames comes she suggests to him that they flee together.  Radames refuses at first, but Aida manages to persuade him.  He tells her the route the army are going to take.  Amonasro, who has been listening secretly, then comes out of hiding and reveals that he is the King of Ethiopia.  Radames feels he has betrayed his country because he revealed a military secret.  He refuses to flee with Aida and her father.  The guards capture him.