See this legally free ebook:

  • The Independence of the Holy See: with an Appendix containing the Papal Allocution of March, 1877, and an English translation, by Henry Edward Manning (London: Henry S. King and Co., 1877). Available at Internet Archive and Open Library. With a second copy at Internet Archive and Open Library.

In remembrance of the Battle of Sorbara (2 July 1084), where Countess Matilda the Great and her outnumbered army defeated the forces of the Holy Roman Empire, thus protecting (for a time) the freedom of the Church. For more legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject). For God and Saint Peter!