Pope Honorius I

Honorius I served as bishop of Rome from 625 to 638, a Campanian-born pope active during the reign of the emperor Heraclius. An energetic administrator, he promoted the conversion of the Lombards and the British Isles, restored Roman churches and aqueducts, and reorganized papal estates. He is best remembered for the controversy over Monothelitism: in letters to Patriarch Sergius of Constantinople he appeared to endorse the doctrine of a single will in Christ, and for this the Third Council of Constantinople (680-681) posthumously anathematized him as a heretic decades after his death - a condemnation later cited in debates over papal infallibility.