Leo XIII – Testem Benevolentiae
![Leo XIII – Testem Benevolentiae Leo XIII – Testem Benevolentiae](https://thecatholicwire.org/wp-content/uploads/2022/07/Leo-XIII.jpg)
An Apostolic Letter of Leo XIII to Cardinal Gibbons of Baltimore concerning Americanism
Gregory XVI – Mirari Vos
![Gregory XVI – Mirari Vos Gregory XVI – Mirari Vos](https://thecatholicwire.org/wp-content/uploads/2021/09/GregoryXVI.jpg)
An encyclical of Gregory XVI concerning Indifferentism and Liberalism
Pius XII – Ad Caeli Reginam
![Pius XII – Ad Caeli Reginam Pius XII – Ad Caeli Reginam](https://thecatholicwire.org/wp-content/uploads/2022/05/Pius-XII.jpg)
An encyclical of Pius XII concerning the Queenship of the Blessed Virgin Mary