sentences:  In 1519 Pope Leo X authorized the religious to elect their own regular superior, a claustral prior independent of the commendatory abbot, who from this time forward was always to be a cardinal.From 1625, when the abbey was affiliated to the Cistercian Congregation of St. Bernard in Tuscany, until its suppression at the Napoleonic invasion in 1812, the local superior was a regular abbot, but without prejudice to the commendatory abbot.The best known of this series of regular abbots was the second, Dom Ferdinand Ughelli, who was one of the foremost literary men of his age, the author of "Italia Sacra" and numerous other works.