sentences:  His scholarly works attracted attention and won for him in 1858 the chair of ecclesiastical history in the University of Vienna.In 1859 he was recalled by his superiors to Heiligenkreuz, where he continued as professor until 1877.During this time he composed his first major work, "Originum Cisterciensium Liber Primus" (Vienna, 1877), in which he describes the foundation of the Cistercian Order, its organization and extension, and mentions many of those who, under various titles, had honoured it.