Internuncios (also heads of missions) rank below nuncios, being of the rank of an envoy or minister, while a legate a latere is a temporary papal representative or a representative for a special purpose.
The Vienna Convention on Diplomatic Relations provides that (article 14(2)) "Except as concerns precedence and etiquette, there shall be no differentiation between heads of mission by reason of their class." Some states give special precedence to representatives of the Holy See, which they are permitted to do by the Convention (article 16(3)) "This article is without prejudice to any practice accepted by the receiving State regarding the precedence of the representative of the Holy See."
wikipedia.org dumped 2003-03-17 with terodump