A noite do castelo
Leonor believes her husband Henrique died in battle and is preparing to marry Fernando. On the eve of the wedding, a mysterious knight in black armor appears and accuses Leonor of breaking her vow of eternal love. He recounts how a captured knight escaped and returned to find his fiancée with another man, then throws a blue ribbon at Leonor’s feet. She faints, and the guests drive the knight from the castle.