The Athenaeum of Ohio – Mount St. Mary's Seminary of the West, originally St. Francis Xavier Seminary, is the third-oldest Roman Catholic seminary in the United States and is currently located at 6616 Beechmont Avenue in the Cincinnati, Ohio neighborhood of Mt. Washington, in the former Saint Gregory Seminary buildings. It was established by Bishop Edward D. Fenwick, the first Bishop of Cincinnati in 1829 along with The Athenaeum (later Xavier University and St. Xavier High School), which opened in 1831, in downtown Cincinnati.