Papal States
Antonelli, Cardinal Giacomo, Papal States, Papal States: Exiles and Political Prisoners, The Opening of the Roman Inquisition's Centra
Catacombs: Witness To Early Heroism
The Pope's Message to the Pontifical Commission for Sacred Archaeology.
Christian martyrs of Rome
A short set of articles about the early Christian martyrs in Rome.
Christianity's First Cathedral
A history and tour of the earliest Christian basilica and home of the Popes, St. John Lateran.
History of Catholicism in Italy
A collection of open source Wikipedia articles on the history of the Catholic Church in Italy.