Vatican City has a rich history dating back to the 1st century AD. It was established as an independent city-state in 1929 and is the smallest country in the world both by area and population. The flag of Vatican City features the crossed keys of St. Peter and the Papal Tiara. Famous landmarks include the Sistine Chapel, St. Peter's Basilica, and St. Peter's Square. The Pope serves as the absolute monarch and bishop of Rome. Vatican City has a population of around 900 citizens and uses Italian as its primary language. It is governed as an elective theocratic absolute monarchy.