By Subject of Literary Work - Popes or papacy
- The Agony and the Ecstasy
- American Catholic
- Apologia pro Vita Sua
- Beyond the Alps
- The Bishop Orders His Tomb at Saint Praxed’s Church
- The Cenci
- Clarisa
- The Cuttlefish
- The Deputy
- Galileo
- His Holiness
- The History of Rome
- Hitler’s Pope
- The Holy Sinner
- Imaginary Conversations of Literary Men and Statesmen
- King Johan
- The Last Starship from Earth
- Man of the Century
- The March of Folly
- Oration on the Dignity of Man
- A Passion in Rome
- The Pope’s Rhinoceros
- The Quality of Sprawl
- The Saint
- Saints and Sinners
- Thomas Cranmer
- The Twilight of the Gods and Other Tales
- The Ugly Duchess
- Witness to Hope
