Pope Pius VII is known for his lengthy papacy, which saw significant struggles with Napoleon Bonaparte, including Pius's imprisonment and eventual restoration. He played a key role in re-establishing the papacy's independence after the Napoleonic Wars. Birth name: Barnaba Niccolò Maria Luigi Chiaramonti Nationality: Papal States Born: August 14, 1742 Died: August 20, 1823 Pontificate: March 14, 1800 – August 20, 1823