High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Roman Catholic Archdiocese of Kansas City in Kansas is a Roman Catholic archdiocese in Kansas. The original diocese was formed on May 22, 1877 as the Diocese of Leavenworth. The Diocese was renamed Kansas City in Kansas on May 10, 1947 and elevated to archdiocese on August 9, 1952. The Archdiocese of Kansas City in Kansas is part of a long line of diocese and vicariates covering the same area, namely: Vicariate Apostolic of Indian Territory East of the Rocky Mountains (1850 1857); Vicariate Apostolic of Kansas (1857 1877); Diocese of Leavenworth (1877 1891); Diocese of Kansas City, Kansas (1891 1897); Diocese of Leavenworth (1897 1947); Diocese of Kansas City in Kansas (1947 1952); Archdiocese of Kansas City in Kansas (1952 present). All of the former diocese were under the authority of the Archdiocese of Saint Louis.