The Papal States were established, beginning the temporal power of the pope in central Italy.
Popes temporarily resided in Avignon, France, reducing the papacy's influence in Rome.
Pope Gregory XI returned the papacy to Rome, ending the Avignon Papacy.
The Kingdom of Italy annexed the Papal States, diminishing the pope's temporal authority.
The Lateran Treaty established Vatican City as an independent state and recognized the sovereignty of the Holy See.