Sedevacantism: Canonical and Theological Issues

Sedevacantism is the belief that the chair (sede) of Peter is vacant (vacante) meaning that the Catholic Church has no pope. The vast majority of Sedevacantists believe that Pope Pius XII was the last legitimate pope of the Church and that subsequent popes, by nature of their heresy, have separated themselves from the Church and have been consequently ineligible to become pope. This monograph will explore the Sedevacantist position in light of the Catholic understanding of heresy with reference to canon law and Church theologians and demonstrate how Sedevacantism is an unsound position.

This is a companion discussion topic for the original entry at