What is “a papal legate”?

The story behind the answer

These envoys were empowered to act with the pope’s authority—convening synods, arbitrating disputes, negotiating with kings, and even preaching crusades. That distinguishes them from the distractors: a “successor” is the next elected pope; “someone responsible for a church” is a parish priest or rector; and although a legate might be a bishop or cardinal, on mission he did not answer to local bishops—he outranked them.

In the Middle Ages there were legati a latere (“from the pope’s side”), usually cardinals sent on urgent tasks, and legati nati, archbishops holding permanent legatine powers in their regions. Notable examples include Cardinal Humbert in 1054 during the events leading to the Great Schism and Cardinal Pelagius in the Fifth Crusade, showing how legates projected papal policy across Christendom.