Resumen: A la luz de crónicas y documentos del siglo XV, las Coplas de Juan de Dueñas al infante don Enrique, poema de cancionero que constituye una fuente histórica de notable interés para el conocimiento del entorno militar, cortesano y literario de Juan de Navarra, futuro Juan II de Aragón, hubo de ser escrito en Castilla entre 1440 y 1443, años previos a la derrota en Olmedo de los infantes de Aragón.   Palabras clave: Juan de Dueñas, Enrique de Aragón, Juan de Navarra, Juan II de Castilla, siglo XV, infantes de Aragón   The Coplas de Juan de Dueñas al infante don Enrique, a Castilian poem of the 15th century, is a historical source of notable interest to explore the military environment of the time, as well as the court and literary world of John of Navarra, who would later become John II of Aragon. An analysis of its contents, in the light of contemporary chronicles and documents, reveals it must have been written in Castile between 1440 and 1443; that is, prior to the defeat of the Infantes of Aragon in Olmedo. Keywords: Juan de Dueñas, John of Navarra, John II of Castile, Infants of Aragon, 15th century