Papal legate

A Papal Legate -from the Latin, authentic Roman title Legatus- is a personal representative of the Pope to the nations, or rather to some part of the universal church. He is empowered on the matters of unity of the catholic faith and for the settlement of ecclesiastical matters.

Legatus Missus

Literally 'send Legate' (a pleonasm!), refers by contrast to a specific task ('mission')

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