High Quality Content by WIKIPEDIA articles! Pope Gregory XVI (18 September 1765 – 1 June 1846), born Bartolomeo Alberto Cappellari, named Mauro as a member of the religious order of the Camaldolese, was Pope of the Catholic Church from 1831 to 1846. Strongly conservative and traditionalist, he opposed democratic and modernising reforms in the Papal States and throughout Europe, seeing them as fronts for revolutionary leftism, and sought to strengthen the religious and political authority of the papacy (see Ultramontanism).