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Wiki information Apocrisiarius:
An apocrisiarius, the Latinized form of apokrisiarios, sometimes Anglicized as apocrisiary, was a high diplomatic representative during Late Antiquity and the early Middle Ages. The corresponding Latin term was responsalis. The title was used by...
The apocrisiarius or apocrisiary was the legate from the Pope to the Patriarch of Constantinople, circa 452-743, equivalent to the modern nunciature.