The Two Powers: The Papacy, the Empire, and the Struggle for Sovereignty in the Thirteenth CenturyEbookThe Two Powers: The Papacy, the Empire, and the Struggle for Sovereignty in the Thirteenth CenturybyBrett Edward WhalenRating: 0 out of 5 stars0 ratingsSave The Two Powers: The Papacy, the Empire, and the Struggle for Sovereignty in the Thirteenth Century for later