Pope from 772. By persuading Charlemagne to conquer Lombardy (774) and depose its king, Hadrian freed the Papacy from a long-standing menace. He also enlisted Charlemagne's help in suppressing adoptianism and supported his efforts to achieve unity in liturgy and canon law. See also Gregorian Sacramentary.
Subjects: Christianity — Medieval and Renaissance History (500 to 1500).