Proof of the Papacy: The Schism of the Universal Church (A.D. 700-1053)

Proof of the Papacy: Rome During the Years of the Rising East (A.D. 501-700)

Proof of the Papacy From Ephesus to Chalcedon (A.D. 420-500)

Proof of the Papacy From St. Augustine to the Council of Milevis (A.D. 400-420)

Proof of the Papacy From Nicaea to Constantinople I (A.D. 300-400)

Proof of the Papacy in the Ante-Nicene Church (A.D. 00-300)