تاريخ إسبانيا
De Isla was a professor of philosophy and theology in Segovia, Santiago de Compostela, Medina del Campo and Pamplona. In Pamplona he translated "The Compendium of the History of Spain" by Father Duchesne and the "Christian Year" by Father Jean Croisset, also noted as a preacher in Valladolid and Zaragoza.