Pope Innocent III (Latin: Innocentius III; born Lotario de' Conti di Segni; 22 February 1161 – 16 July 1216) was the head of the Catholic Church and sovereign of the Papal States from 8 January 1198 until his death in 1216.
Pope Innocent was one of the most powerful and influential of the medieval popes. He exerted a wide influence over the Christian states of Europe, claiming supremacy over all of Europe's kings. He was central in supporting the Catholic Church's reforms of ecclesiastical affairs through his decretals and the Fourth Lateran Council. This resulted in a considerable refinement of Western canon law.