Holy See (Vatican City)

ecclesiastical elective monarchy; self-described as an "absolute monarchy"

Popes in their secular role ruled portions of the Italian peninsula for more than a thousand years until the mid-19th century, when the newly established Kingdom of Italy seized many of the Papal States. In 1870, the pope's holdings were further circumscribed when Rome itself was annexed. Disputes between Italy and a series of "prisoner" popes were resolved in 1929 by three Lateran Treaties, which established the independent state of Vatican City and granted Roman Catholicism special status in Italy.