Pope Honorius I

Born in Campania, consecrated bishop of Rome on 27 October 625, Honorius spent much of his papacy pushing the frontiers of Christendom: he sent Saint Birinus to convert the West Saxons, granted the pallium to Canterbury and York, and pressed the Irish and British churches to align their Easter dating with Rome. But his letters to Patriarch Sergius I of Constantinople entangled him in the Monoenergism controversy, and he endorsed Monothelite doctrine on whether Christ possessed one will or two. When the Third Council of Constantinople met in 681, four decades after Honorius died on 12 October 638, it anathematized him for the heresy. Pope Leo II confirmed the condemnation, faulting Honorius for failing to stamp out error. Eight centuries later, opponents of papal infallibility brandished his case as proof that popes can teach falsehood.