Nuncio is an ecclesiastical diplomatic title, derived from the ancient Latin word, Nuntius, meaning "envoy." This article addresses this title as well as derived similar titles, all within the structure of the Roman Catholic Church. Terminology and history A Papal Nuncio (officially known as an Apostolic Nuncio) is a permanent diplomatic representative (head of diplomatic mission) of the Holy See to a state or international organization (for example, the Arab League), having the rank of an ambas… (More on Nuncio)