Unam Sanctam and the Outrage at Anagni

The dispute between Boniface and Philip IV of France culminated in one of the papacy's most sweeping doctrinal statements. Unam Sanctam, issued in 1302, declared that there is one holy church outside of which there is no salvation, that the church holds two swords, spiritual and temporal, and that submission to the pope is necessary for every human being's salvation, language later read as the high water mark of medieval claims to papal supremacy over secular rulers. Philip's response was not theological but physical. On 7 September 1303 his agent Guillaume de Nogaret, working with the hostile Roman noble Sciarra Colonna, led an armed force to Boniface's residence at Anagni, seized the elderly pope and reportedly struck or threatened him, holding him for several days before a local uprising freed him, an episode remembered as the Outrage of Anagni. Boniface returned to Rome but died within a month, and the humiliation is widely read by historians as marking a turning point after which the medieval papacy's claim to stand above kings never fully recovered its former force, a shift confirmed only a few years later when his successors relocated the papal court to Avignon under French influence for nearly seventy years.