Apocrisiarius

·noun A delegate or deputy; especially, the pope's nuncio or legate at Constantinople.

apocrisiarius
ăpocrĭsĭārĭus or ăpocrĭsārĭus, ii, m. [ἀποκρίνομαι, to answer; ἀπόκρισις, an answer] (late Lat.), ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.