The chair of Oriental languages was suppressed by the viceroy in 1808, but again rehabilitated on the restoration of Pope Pius VII in 1814. Mezzofanti held this post until he left Bologna to go to Rome in 1831 as a member of the Congregation for the Propagation of the Faith (Congregatio de Propaganda Fide), the Catholic Church's governing body for missionary activities. In 1833, he succeeded Angelo Mai as Custodian-in-Chief of the Vatican Library, and in 1838 was made cardinal of the title of St. Onofrio al Gianicolo and director of studies in the Congregation for the Propagation of the Faith.[3] His other diverse interests included ethnology, archaeology, numismatics, and astronomy.