The Diocese of Warsaw was erected on 16 October 1798 by Pope Pius VI by the bull Ad universam agri Dominici curam as a diocese subordinate directly to the Holy See. Erected an archdiocese on 30 June 1818 by Pope Pius VII by the bull Militantis Ecclesiae regimini. Between 1946 and 1992 joined by a personal union with the Archdiocese of Gniezno. The most recent territorial changes were introduced by Pope John Paul II on 25 March 1992.