It was commissioned to celebrate the marriage of the Infanta Maria Teresa Rafaela of Spain to Louis, Dauphin of France. La princesse de Navarre opened the wedding festivities, while another new Rameau opera, Platée, closed them. The piece takes the form of a comédie-ballet, effectively a play with a large amount of incidental music, recalling the collaborations of Molière and Lully in the 17th century. Voltaire was a great admirer of Rameau, even considering him too good a composer for such a task. Nevertheless, Rameau wrote around an hour of music for the play, including an overture and three divertissements. Little of it has much bearing on the main action of the drama which concerns the complicated love life of the eponymous mediaeval princess. Voltaire found Rameau to be a demanding and critical collaborator, leading the dramatist to declare: "Poor Rameau is mad...Rameau is as great an eccentric as he is a musician". The production was a spectacular one, involving no less than 180 "extras". Voltaire complained about the acoustics of the hall in which it was staged claiming "the ceiling was so high that the actors appeared pygmies and they couldn't be heard". Nevertheless, the music was a critical success. Much of the material was reworked to produce another opera, Les fêtes de Ramire, later the same year.
Don Pedro, King of Castile, has taken captive Constance, Princess of Navarre. She manages to escape from prison in disguise and takes refuge with Don Morillo, but she is recognised by the young Alamir. Alamir falls in love with Constance and rejects Don Morillo’s daughter Sanchette. The act ends with a divertissement in which warriors, gypsies and astrologers entertain the lords and ladies.
Act 2
The king demands the return of Constance but Alamir vows to protect her. Alamir’s army, in alliance with the French, defeats the Castilians. Constance feels herself falling more and more in love with Alamir but she is reluctant to hurt Sanchette and sees Alamir’s lack of noble birth as a barrier to their union. The Graces distract her from her cares with a divertissement.
Act 3
Alamir returns from battle in triumph and reveals his true identity as the Duke of Foix. He and Constance can now marry and the play ends with a divertissement led by Cupid against the backdrop of the Pyrenees.
