Sedevacantism is a traditionalist Catholic movement which holds that since the 1958 death of Pius XII the occupiers of the Holy See are not valid popes due to their espousal of one or more heresies an
The Mexican Jesuit priest, Fr. Joaquín Sáenz y Arriaga, longtime associate of Los TECOS, was one of the pioneers of sedevacantism after the Second Vatican Council.
Francis Schuckardt was a major figure in American sedevacantism, founding what would eventually become the Congregation of Mary Immaculate Queen. His reception of religious orders from Old Catholic sources would remain a subject of contention.
Following the likes of Charles René Billuart, the Dominican faction argued that a heretical Pope must be juridically deposed by procedure of a General Council. This led them to develop the sedeprivationist thesis.
Citing the opinion of Francisco de Vitoria, Professor Tomás Tello Corraliza proposed that "faithful bishops" in a General Council could theoretically elect a new Pope.
The Society of Saint Pius X is a traditionalist Catholic organization founded in 1970 by Archbishop Marcel Lefebvre. Considered schismatic by the Catholic Church, the society comprises priests and sem
Sedevacantism
…New York, founded in 1967 and led by Michael and Peter Dimond. Society of Saint Pius V (SSPV), formed in 1983 when nine American priests split from the Society of Saint Pius X over a number of issues including using the liturgical books implemented under Pope John XXIII. It operated in North America from Oyster Bay Cove, New…
Lefebvre, the society's founder, celebrating the Traditional Latin Mass
Veldhoven, Archbishop Lefebvre giving Communion assisted by Franz Schmidberger
Saint-Nicolas-du-Chardonnet, Paris, occupied by SSPX since 1977
St. Willibrord's Church, Utrecht, Netherlands, operated by SSPX since 2015