nuncio

noun3

1. •
   The ecclesiastic title of a permanent diplomatic representative of the Roman Catholic Church to a sovereign state or international organization, who is accorded a rank equivalent to an accredited ambassador, and may also be given additional privileges including recognition as Dean in a country's diplomatic corps.

   • Seeing as the meeting happened at the nunciature in Washington, it could only have happened with the approval and participation of the nuncio, Archbishop Carlo Maria Vigano. — 2015
2. •
   One who bears a message; a messenger.
3. •
   (historical) Any member of any Sejm of the Kingdom of Poland, Polish–Lithuanian Commonwealth, Galicia (of the Austrian Partition), Duchy of Warsaw, Congress Poland, or Grand Duchy of Posen.