In 1336, Pedro, heir to the Portuguese crown, marries Constanza Manuel de Villena, a Castilian noblewoman, for political reasons; but the impulsive prince ends up giving in to his love for Inés de Castro, his wife's lady-in-waiting.
Olvido is a seamstress apprentice who dreams of becoming a singer. She achieves her goal with the help of her friend María del Pilar.
