Joan of Navarre (around 1370; – 9 July 1437 in Havering-atte-Bower).
Duchess of Brittany. Time of Charles VI the Beloved (1368-1422)
Duchesse de Bretagne. Du Temps de Charles VI le Bien-Aimé
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The lady there is probably Joan of Navarre was by marriage Duchess of Brittany and Queen Consort of England. She was the daughter of King Charles II of Navarre and Joan of France, daughter of King John II of France.
Source: Costumes historiques de ville ou de théatre et travestissements. Author: Achille Devéria and José Domínguez Bécquer. Engraver: De Cattier. Publisher Paris: Goupil et Vibert 1831. Publisher London: Charles Tilt 1839. Printed by: Lemercier & Cie.