Sedeprivationism

Sedeprivationism is an ideological school or party of the traditionalist Roman Catholic movement that holds that Popes since John XXIII have been defective Popes, following the principles of the late French theologian Michel Louis Guérard des Lauriers, O.P., as Lauriers set it out in his thesis published in the Cahiers du Cassiciacum and therefore called the "Cassiciacum thesis".