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Innocent III (born 1160/61, Gavignano Castle, Campagna di Roma, Papal States [now in Italy]—died July 16, 1216, Perugia) was the most significant pope of the Middle Ages. Elected pope on January 8, 1198, Innocent III reformed the Roman Curia, reestablished and expanded the pope’s authority over the Papal States, worked tirelessly to launch Crusades to recover the Holy Land, combated heresy in Italy and southern France, shaped a powerful and original doctrine of papal power...