The "Tractado de amores de Arnalte y Lucenda" is dedicated to Queen Isabel's ladies-in-waiting and to the queen herself. Its second edition describes San Pedro as a servant of Don Juan Téllez-Girón, Count of Urueña. Don Juan was powerful, because he was the half brother of Isabel and was favored by King Enrique IV of Castile. San Pedro dedicated "Desprecio de la Fortuna" to him, calls him “his lord,” and says that he was in his service for 29 years. San Pedro dedicates "Cárcel de Amor" to Diego Fernández de Córdoba. Diego Fernández was also related to the Téllez-Girón family, because he married Juana Pacheco, a niece of the count. He was 'alcaide de los donceles', or the leader of a light-cavalry troop of privileged young men who served as the king's bodyguard. San Pedro also mentions Doña Marina Manuel, a member of the highest Castilian nobility, in this prologue.