The pope, by virtue of his primacy of jurisdiction, has the right to send legates to provide for the unity of Faith and for ecclesiastical discipline… - Bonaventura Cerretti

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The pope, by virtue of his primacy of jurisdiction, has the right to send legates to provide for the unity of Faith and for ecclesiastical discipline, and to choose them at will. Though self-evident, this authority of the pope has been contested from a very early period.