Formation of the Papal States

Timeline

1. 754–756Rome · LazioFrankish King Pepin twice campaigned into Italy at the request of Pope Stephen II; after defeating the Lombards he granted nearly half of Lombard territory to the pope, establishing the legal and military-protection foundation of the papal temporal lands and breaking free from Byzantine direct jurisdiction over Rome.
2. 800–814St. Peter's Basilica, Rome · RomeLeo III crowned Charlemagne as Emperor of the Romans on Christmas Day, giving the papacy the endorsement of sacred authority; under imperial protection the Papal States expanded their administration and management of church estates, forming a political structure of mutual dependence between papal and imperial power.
3. c. 817–900Central Italy (the corridor from Rome to Ravenna) · Papal States core regionAfter the empire's division, the papacy used arrangements like the Treaty of Radgaist to establish control over Rome, Ravenna, and surrounding areas among the duchies of Spoleto, Camerino, and others; papal finances and church estate management became increasingly institutionalized, and the Papal States' outline as an independent political entity became clear.