The Battle of Najera, fought in 1367, was a major engagement in the Castilian Civil War, where English forces supported Pedro the Cruel against Henry of Trastamara. The English and Pedro's forces were victorious, but the victory was temporary. The battle was notable for the involvement of English mercenaries and the Black Prince.

The Battle of Najera is a subject in the works of Jean Froissart and other chroniclers, who emphasized the chivalry and brutality of the war. It contributed to the Black Prince's legendary reputation and appeared in English and French verse. The battle's dramatic events and political implications made it a popular subject for later historical poetry.