Sedevacantism Sedevacantism is the position held by a minority of Traditionalist Catholics who claim that the Papal See has been vacant since the death of Pope Pius XII in 1958 (or, according to some, since the death of Pope John XXIII in 1963). Sedevacantists believe that Paul VI (1963–1978), John Paul I (1978), John Paul II (1978–2005) and Benedict XVI (since 2005) have been neither true Catholics nor true popes, but rather notorious heretics, because of allegedly having espoused Modernism. Sedevacantism
Society of St. Pius V The Society of St. Pius V (SSPV) is a society of Traditionalist Catholic priests formed in 1983 and based in Oyster Bay Cove, New York. Society_of_St._Pius_V