👉 An antipapalist is a person who opposes or criticizes the papacy, which has been an institution of the Roman Catholic Church for centuries. The term comes from the Latin phrase "antiphilus," meaning "against filial piety." Antipapalists believe that the Pope is not legitimate and that the Papal States are false and corrupt, which are the main reasons why they have been at odds with the Church for centuries. The idea of an antipapalist