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In Catholicism, the doctrine (or theory) of the two swords is an exegesis of Luke 22:38 elaborated in the Middle Ages. It can be understood as a particular justification for the Gelasian doctrine of "the sacred authority of the priesthood and the royal power".[1]
By the early 13th century, the two swords were the subject of serious study and debate among canon lawyers and decretalists. The main question was whether Bernard was right. Had God given each sword to its rightful bearer, the Holy Roman Emperor and the Pope, or had he given both to the Pope, who then bestowed the material sword on the emperor? When Pope Gregory IX started the War of the Keys against Emperor Frederick II in 1228, it was on the basis of a claim to control both swords. In any case, however, churchmen could not bear actual swords; the material swords was to be wielded by laymen, even if under papal authority.[2]
References
^ abPatrick Stephen Healy, "Two Swords, Doctrine of the", in Robert E. Bjork (ed.), The Oxford Dictionary of the Middle Ages (Oxford University Press, 2010).
^Brett Edward Whalen, The Two Powers: The Papacy, the Empire, and the Struggle for Sovereignty in the Thirteenth Century (University of Pennsylvania Press, 2019), p. 37.
