1) Diplomat 2) Diplomatist 1) Messenger 
messenger between two parties; low-ranking papal legate
• (n.) A messenger between two parties. • (n.) A representative, or charge d`affaires, of the pope at a foreign court or seat of government, ranking next below a nuncio.
(from the article `nuncio`) ...representative automatically becomes dean of the diplomatic corps there. In 1965 the name pronuncio was given to those ambassadors whose rank in ... ...and in 1965 began to appoint pro-nuncios. It accredited apostolic nuncios only to those few Roman Catholic states where the papal envoy is always ... .....
In`ter·nun'ci·o noun ; plural Internuncios . [ Latin internuntius ; inter between + nuntius , nuncius , messenger: confer Italian internunzio . See Nuncio .] 1. A messenger between two parties. Johnson. 2. A represe...
An intemuncio is an envoy of the pope, sent to small states and republics, distinguished from the nuncio who represents the pope at the courts of emperors and kings.
[n] - (Roman Catholic) a diplomatic representative of the Pope ranking below a nuncio
a papal ambassador ranking next below a nuncio.