The Vatican City State is home to the governing body of the Roman Catholic Church, the Holy See, and is a neutral, micro-state, absolute theocratic-monarchy within the city of Rome. The current sovereign of Vatican City is HH Pope Benedict XVI. Vatican City has existed since 1929 when Pope Pius XI signed the Lateran Treaty with the Kingdom of Italy. Technically the Vatican State has no national anthem though what is usually taken for one is the official papal anthem.
The Papal Anthem: The Pontifical March