Pope Innocent iii (feb 22, 1161 – jul 16, 1216)

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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 within the ...
In 1198, Innocent wrote to the prefect Acerbius and the nobles of Tuscany expressing his support of the medieval political theory of the sun and the moon. His papacy asserted the absolute spiritual authority of his office, while still respecting the temporal authority of kings.