Honorius I, (born, Roman Campania [Italy]—died October 12, 638), pope from 625 to 638 whose posthumous condemnation as a heretic subsequently caused extensive controversy on the question of papal infallibility.

During his papacy, Honorius became involved in early discussions regarding the doctrine of Monothelitism, which is the teaching that Christ has only one energy and one will, in contrast with the teaching that He has two energies and two wills, both human and divine. Patriarch Sergius I of Constantinople wrote an initial letter informing Honorius of the Monothelite controversy, asking Honorius to endorse a position that Church unity should not be endangered by having any discussions or disputes over Christ’s possessing one energy or two. Sergius added that the doctrine of two energies could lead to the erroneous belief that Jesus has two conflicting wills. Pope Honorius’ reply in 635 endorsed this view that all discussions should cease, and agreed that Jesus does not have two conflicting wills, but one will, since Jesus did not assume the vitiated human nature tainted by Adam’s fall, but human nature as it existed prior to Adam’s fall.