Leo XIII – Testem Benevolentiae
![leo-xiii](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
![](https://thecatholicwire.org/wp-content/uploads/2021/09/GregoryXVI.jpg)
An encyclical of Gregory XVI concerning Indifferentism and Liberalism
An Apostolic Letter of Leo XIII to Cardinal Gibbons of Baltimore concerning Americanism
An encyclical of Gregory XVI concerning Indifferentism and Liberalism