In part eighteen of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Council of Constance, which resolved a conflict between three papal claimants!

In part seventeen of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Council of Vienne, in which the pope, pressured by monarchs, condemned the Knights Templar.

In part sixteen of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Second Council of Lyon, which attempted reunification with the Eastern Churches.

In part fifteen of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the First Council of Lyon, which resolved conflicts between the papacy and the Holy Roman Emperor.

In part fourteen of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Fourth Lateran Council, which addressed the crusades, clerical reform, and heresies.

In part thirteen of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Third Lateran Council, which curbed fiscal corruption among the clergy.

In part twelve of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Second Lateran Council, which affirmed the true pope after a brief schism.

In part eleven of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the First Lateran Council, the first ecumenical council held in Rome, which addressed the investiture controversy.

In part ten of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Fourth Council of Constantinople, in which the Roman Catholic Church helped resolve a dispute among the Eastern churches.

In part nine of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the Second Council of Nicea, the final ecumenical council recognized by the Greek Orthodox Church, which addressed the iconoclast controversy.