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An internuncio is a Vatican diplomat who holds the rank of minister plenipotentiary. They are accredited to a civil government and perform duties similar to those of a nuncio, who is an ambassador representing the Holy See. The term "internuncio" can also refer to a papal legate of lower rank than a nuncio or, more generally, a messenger or go-between.12

In modern diplomatic practice, as defined by the Vienna Convention on Diplomatic Relations, internuncios are accredited to heads of state, placing them in a category below ambassadors and nuncios. The title of pro-nuncio was later created to grant entry into the highest diplomatic class.3

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