Napoleon I reestablishing Catholicism in France.
The first pope with this name excommunicated a Gnostic named Marcion. One man who would later adopt this papal name served in the court of Frederick III and failed to gain support for a crusade against the Turks at the 1459 Council of Mantua. A later pope of this name issued a bull calling for the deposition of Elizabeth I. This was the name of a pope who signed a concordat with (*) Napoleon I reestablishing Catholicism in France. A pope of this name issued Mit brennender Sorge after a concordat he signed with Hitler was broken. For 10 points, give this name shared by the longest serving pope, the ninth, who ruled during the Italian unification.
The first pope with this name excommunicated a Gnostic named Marcion.
Pius