Saint Celestine V founded the Celestine order; he was the first pontiff to abdicate. Pietro da Morrone was a Benedictine in his youth but soon became a hermit and lived in the Abruzzi Mountains, near Sulmona. His rigorous asceticism attracted followers, and he became the head of a group of hermits (ca. 1260) that were later called Celestines and incorporated into the Benedictine order.
