The 1977 Congress of St. Louis was an international gathering of nearly 2,000 Anglicans, united in their rejection of theological changes introduced by the Episcopal Church in the United States of America in the General Convention of 1976 and, ultimately, by the 1979 revision of the Book of Common Prayer. Anglicans who attended this congress felt that these changes amounted to foundational changes in the Episcopal Church and meant that it had "departed from Christ's One, Holy, Catholic and Apostolic Church."