Warring "Vicar of Christ"

When two popes, and later three popes, vied for supremacy, the medieval church entered a dramatic, forty-year crisis of authority.

Pope and international diplomat

New book reopens questions on self-denial and "what is lacking in Christ's afflictions."

The unknown story of how John Paul II ushered Campus Crusade into Catholic Poland.

Jan Hus hoped his incendiary preaching and heated rebukes would purify a tainted church, but the flames consumed him first.

Luther and Calvin challenged the Catholic church on many key teachings—but not on the doctrine of last things.