Pope Innocent III
Pope from 1198 to 1216, Innocent III strengthened papal authority, intervened in European politics, and convened the Fourth Lateran Council.
Fourth Lateran Council: A major church council held in Rome in 1215 that defined doctrine and enacted broad reforms. Innocent convened it to address church reform, heresy, and crusading.
Dictatus Papae: A collection of propositions about papal authority associated with Pope Gregory VII's reform program. It offers an earlier, more concise statement of claims Innocent pursued through practice.
Gregorian Reform: A movement to reform the medieval church, strengthen clerical discipline, and free church offices from lay control. It supplied the reforming tradition behind Innocent's expansive view of papal authority.
King John of England: King of England from 1199 to 1216, whose reign included conflict with the papacy and the barons. His quarrel with Innocent led to an interdict, excommunication, and eventual submission.
Catharism: A medieval Christian movement condemned as heretical by the Catholic Church, especially influential in southern France. Its suppression became a test of Innocent's preferred methods of preaching and coercion.
Albigensian Crusade: A military campaign launched in 1209 against Cathar communities and their supporters in southern France. Innocent called for the campaign after efforts to suppress Catharism through preaching failed.
Papal bull: A formal papal document authenticated by a lead seal and used to issue authoritative decisions. Innocent used papal letters and decrees to communicate decisions across Christendom.
Pope Gregory VII: Pope from 1073 to 1085 who asserted church independence and clashed with Emperor Henry IV. His confrontation with secular rulers established precedents Innocent adapted.
Philip II of France: King of France from 1180 to 1223 who expanded royal power and contested papal demands. Innocent pressed Philip to restore his repudiated wife, Ingeborg of Denmark.
Fourth Crusade: A crusading expedition launched in 1202 that ended with the capture and sack of Constantinople in 1204. Innocent called the crusade but condemned its diversion against a Christian capital.