Possible Clues:

• 'The Gods Love Nubia' musical
• Verdi opera set in ancient Egypt
• Musical based on an opera
• Verdi's operatic lady
• Lover of Radames, in opera
• "O patria mia" opera
• Enslaved princess of opera
• Antonio Ghislanzoni wrote its libretto
• Work commissioned by the khedive of Egypt
• 'Radames' Letter' musical