Sedevacantism

Core beliefs and rationale

Most sedevacantists claim that a pope who publicly and obstinately teaches heresy ceases to be pope because fidelity to revealed truth is essential to the office. Some identify the break with continuity as occurring after the death of Pope Pius XII in 1958; others point to changes associated with the Second Vatican Council and later magisterial developments.

History and development

The movement emerged in the 1960s and 1970s among clerics and laity disaffected by liturgical reform and ecumenical policies. It grew in scattered chapels and communities that rejected official post‑conciliar teachings and sought to retain pre‑Vatican II rites and disciplines.

Variations and groups

• Some adherents are strict sedevacantists who assert that no legitimate pope has reigned since the identified date.
• Others adopt related theories, such as sedeprivationism, which holds a pope may be pope materially but not formally while professing error.
• Small societies and independent chapels adopt sedevacantist positions; they are distinct from traditionalist groups that remain in communion with Rome.

Critics, including the wider Catholic Church and most theologians, reject sedevacantism as a minority interpretation. Officially, the Church maintains continuity of the papacy and its magisterium. For context on the term and disputed claims about the papal office, see the entry on the papal see.

Understanding sedevacantism requires distinguishing it from broader traditionalist concerns about liturgy and doctrine: not all who favor older rites deny the legitimacy of recent popes. The movement remains small but notable for its theological challenge to contemporary notions of papal authority.